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linux/lib/test_xarray.c
Linus Torvalds 61307b7be4 The usual shower of singleton fixes and minor series all over MM, 
documented (hopefully adequately) in the respective changelogs.  Notable
 series include:
 
 - Lucas Stach has provided some page-mapping
   cleanup/consolidation/maintainability work in the series "mm/treewide:
   Remove pXd_huge() API".
 
 - In the series "Allow migrate on protnone reference with
   MPOL_PREFERRED_MANY policy", Donet Tom has optimized mempolicy's
   MPOL_PREFERRED_MANY mode, yielding almost doubled performance in one
   test.
 
 - In their series "Memory allocation profiling" Kent Overstreet and
   Suren Baghdasaryan have contributed a means of determining (via
   /proc/allocinfo) whereabouts in the kernel memory is being allocated:
   number of calls and amount of memory.
 
 - Matthew Wilcox has provided the series "Various significant MM
   patches" which does a number of rather unrelated things, but in largely
   similar code sites.
 
 - In his series "mm: page_alloc: freelist migratetype hygiene" Johannes
   Weiner has fixed the page allocator's handling of migratetype requests,
   with resulting improvements in compaction efficiency.
 
 - In the series "make the hugetlb migration strategy consistent" Baolin
   Wang has fixed a hugetlb migration issue, which should improve hugetlb
   allocation reliability.
 
 - Liu Shixin has hit an I/O meltdown caused by readahead in a
   memory-tight memcg.  Addressed in the series "Fix I/O high when memory
   almost met memcg limit".
 
 - In the series "mm/filemap: optimize folio adding and splitting" Kairui
   Song has optimized pagecache insertion, yielding ~10% performance
   improvement in one test.
 
 - Baoquan He has cleaned up and consolidated the early zone
   initialization code in the series "mm/mm_init.c: refactor
   free_area_init_core()".
 
 - Baoquan has also redone some MM initializatio code in the series
   "mm/init: minor clean up and improvement".
 
 - MM helper cleanups from Christoph Hellwig in his series "remove
   follow_pfn".
 
 - More cleanups from Matthew Wilcox in the series "Various page->flags
   cleanups".
 
 - Vlastimil Babka has contributed maintainability improvements in the
   series "memcg_kmem hooks refactoring".
 
 - More folio conversions and cleanups in Matthew Wilcox's series
 
 	"Convert huge_zero_page to huge_zero_folio"
 	"khugepaged folio conversions"
 	"Remove page_idle and page_young wrappers"
 	"Use folio APIs in procfs"
 	"Clean up __folio_put()"
 	"Some cleanups for memory-failure"
 	"Remove page_mapping()"
 	"More folio compat code removal"
 
 - David Hildenbrand chipped in with "fs/proc/task_mmu: convert hugetlb
   functions to work on folis".
 
 - Code consolidation and cleanup work related to GUP's handling of
   hugetlbs in Peter Xu's series "mm/gup: Unify hugetlb, part 2".
 
 - Rick Edgecombe has developed some fixes to stack guard gaps in the
   series "Cover a guard gap corner case".
 
 - Jinjiang Tu has fixed KSM's behaviour after a fork+exec in the series
   "mm/ksm: fix ksm exec support for prctl".
 
 - Baolin Wang has implemented NUMA balancing for multi-size THPs.  This
   is a simple first-cut implementation for now.  The series is "support
   multi-size THP numa balancing".
 
 - Cleanups to vma handling helper functions from Matthew Wilcox in the
   series "Unify vma_address and vma_pgoff_address".
 
 - Some selftests maintenance work from Dev Jain in the series
   "selftests/mm: mremap_test: Optimizations and style fixes".
 
 - Improvements to the swapping of multi-size THPs from Ryan Roberts in
   the series "Swap-out mTHP without splitting".
 
 - Kefeng Wang has significantly optimized the handling of arm64's
   permission page faults in the series
 
 	"arch/mm/fault: accelerate pagefault when badaccess"
 	"mm: remove arch's private VM_FAULT_BADMAP/BADACCESS"
 
 - GUP cleanups from David Hildenbrand in "mm/gup: consistently call it
   GUP-fast".
 
 - hugetlb fault code cleanups from Vishal Moola in "Hugetlb fault path to
   use struct vm_fault".
 
 - selftests build fixes from John Hubbard in the series "Fix
   selftests/mm build without requiring "make headers"".
 
 - Memory tiering fixes/improvements from Ho-Ren (Jack) Chuang in the
   series "Improved Memory Tier Creation for CPUless NUMA Nodes".  Fixes
   the initialization code so that migration between different memory types
   works as intended.
 
 - David Hildenbrand has improved follow_pte() and fixed an errant driver
   in the series "mm: follow_pte() improvements and acrn follow_pte()
   fixes".
 
 - David also did some cleanup work on large folio mapcounts in his
   series "mm: mapcount for large folios + page_mapcount() cleanups".
 
 - Folio conversions in KSM in Alex Shi's series "transfer page to folio
   in KSM".
 
 - Barry Song has added some sysfs stats for monitoring multi-size THP's
   in the series "mm: add per-order mTHP alloc and swpout counters".
 
 - Some zswap cleanups from Yosry Ahmed in the series "zswap same-filled
   and limit checking cleanups".
 
 - Matthew Wilcox has been looking at buffer_head code and found the
   documentation to be lacking.  The series is "Improve buffer head
   documentation".
 
 - Multi-size THPs get more work, this time from Lance Yang.  His series
   "mm/madvise: enhance lazyfreeing with mTHP in madvise_free" optimizes
   the freeing of these things.
 
 - Kemeng Shi has added more userspace-visible writeback instrumentation
   in the series "Improve visibility of writeback".
 
 - Kemeng Shi then sent some maintenance work on top in the series "Fix
   and cleanups to page-writeback".
 
 - Matthew Wilcox reduces mmap_lock traffic in the anon vma code in the
   series "Improve anon_vma scalability for anon VMAs".  Intel's test bot
   reported an improbable 3x improvement in one test.
 
 - SeongJae Park adds some DAMON feature work in the series
 
 	"mm/damon: add a DAMOS filter type for page granularity access recheck"
 	"selftests/damon: add DAMOS quota goal test"
 
 - Also some maintenance work in the series
 
 	"mm/damon/paddr: simplify page level access re-check for pageout"
 	"mm/damon: misc fixes and improvements"
 
 - David Hildenbrand has disabled some known-to-fail selftests ni the
   series "selftests: mm: cow: flag vmsplice() hugetlb tests as XFAIL".
 
 - memcg metadata storage optimizations from Shakeel Butt in "memcg:
   reduce memory consumption by memcg stats".
 
 - DAX fixes and maintenance work from Vishal Verma in the series
   "dax/bus.c: Fixups for dax-bus locking".
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 jrdKAP9WVJdpEcXxpoub/vVE0UWGtffr8foifi9bCwrQrGh5mgEAx7Yf0+d/oBZB
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 =V3R/
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Merge tag 'mm-stable-2024-05-17-19-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull mm updates from Andrew Morton:
 "The usual shower of singleton fixes and minor series all over MM,
  documented (hopefully adequately) in the respective changelogs.
  Notable series include:

   - Lucas Stach has provided some page-mapping cleanup/consolidation/
     maintainability work in the series "mm/treewide: Remove pXd_huge()
     API".

   - In the series "Allow migrate on protnone reference with
     MPOL_PREFERRED_MANY policy", Donet Tom has optimized mempolicy's
     MPOL_PREFERRED_MANY mode, yielding almost doubled performance in
     one test.

   - In their series "Memory allocation profiling" Kent Overstreet and
     Suren Baghdasaryan have contributed a means of determining (via
     /proc/allocinfo) whereabouts in the kernel memory is being
     allocated: number of calls and amount of memory.

   - Matthew Wilcox has provided the series "Various significant MM
     patches" which does a number of rather unrelated things, but in
     largely similar code sites.

   - In his series "mm: page_alloc: freelist migratetype hygiene"
     Johannes Weiner has fixed the page allocator's handling of
     migratetype requests, with resulting improvements in compaction
     efficiency.

   - In the series "make the hugetlb migration strategy consistent"
     Baolin Wang has fixed a hugetlb migration issue, which should
     improve hugetlb allocation reliability.

   - Liu Shixin has hit an I/O meltdown caused by readahead in a
     memory-tight memcg. Addressed in the series "Fix I/O high when
     memory almost met memcg limit".

   - In the series "mm/filemap: optimize folio adding and splitting"
     Kairui Song has optimized pagecache insertion, yielding ~10%
     performance improvement in one test.

   - Baoquan He has cleaned up and consolidated the early zone
     initialization code in the series "mm/mm_init.c: refactor
     free_area_init_core()".

   - Baoquan has also redone some MM initializatio code in the series
     "mm/init: minor clean up and improvement".

   - MM helper cleanups from Christoph Hellwig in his series "remove
     follow_pfn".

   - More cleanups from Matthew Wilcox in the series "Various
     page->flags cleanups".

   - Vlastimil Babka has contributed maintainability improvements in the
     series "memcg_kmem hooks refactoring".

   - More folio conversions and cleanups in Matthew Wilcox's series:
	"Convert huge_zero_page to huge_zero_folio"
	"khugepaged folio conversions"
	"Remove page_idle and page_young wrappers"
	"Use folio APIs in procfs"
	"Clean up __folio_put()"
	"Some cleanups for memory-failure"
	"Remove page_mapping()"
	"More folio compat code removal"

   - David Hildenbrand chipped in with "fs/proc/task_mmu: convert
     hugetlb functions to work on folis".

   - Code consolidation and cleanup work related to GUP's handling of
     hugetlbs in Peter Xu's series "mm/gup: Unify hugetlb, part 2".

   - Rick Edgecombe has developed some fixes to stack guard gaps in the
     series "Cover a guard gap corner case".

   - Jinjiang Tu has fixed KSM's behaviour after a fork+exec in the
     series "mm/ksm: fix ksm exec support for prctl".

   - Baolin Wang has implemented NUMA balancing for multi-size THPs.
     This is a simple first-cut implementation for now. The series is
     "support multi-size THP numa balancing".

   - Cleanups to vma handling helper functions from Matthew Wilcox in
     the series "Unify vma_address and vma_pgoff_address".

   - Some selftests maintenance work from Dev Jain in the series
     "selftests/mm: mremap_test: Optimizations and style fixes".

   - Improvements to the swapping of multi-size THPs from Ryan Roberts
     in the series "Swap-out mTHP without splitting".

   - Kefeng Wang has significantly optimized the handling of arm64's
     permission page faults in the series
	"arch/mm/fault: accelerate pagefault when badaccess"
	"mm: remove arch's private VM_FAULT_BADMAP/BADACCESS"

   - GUP cleanups from David Hildenbrand in "mm/gup: consistently call
     it GUP-fast".

   - hugetlb fault code cleanups from Vishal Moola in "Hugetlb fault
     path to use struct vm_fault".

   - selftests build fixes from John Hubbard in the series "Fix
     selftests/mm build without requiring "make headers"".

   - Memory tiering fixes/improvements from Ho-Ren (Jack) Chuang in the
     series "Improved Memory Tier Creation for CPUless NUMA Nodes".
     Fixes the initialization code so that migration between different
     memory types works as intended.

   - David Hildenbrand has improved follow_pte() and fixed an errant
     driver in the series "mm: follow_pte() improvements and acrn
     follow_pte() fixes".

   - David also did some cleanup work on large folio mapcounts in his
     series "mm: mapcount for large folios + page_mapcount() cleanups".

   - Folio conversions in KSM in Alex Shi's series "transfer page to
     folio in KSM".

   - Barry Song has added some sysfs stats for monitoring multi-size
     THP's in the series "mm: add per-order mTHP alloc and swpout
     counters".

   - Some zswap cleanups from Yosry Ahmed in the series "zswap
     same-filled and limit checking cleanups".

   - Matthew Wilcox has been looking at buffer_head code and found the
     documentation to be lacking. The series is "Improve buffer head
     documentation".

   - Multi-size THPs get more work, this time from Lance Yang. His
     series "mm/madvise: enhance lazyfreeing with mTHP in madvise_free"
     optimizes the freeing of these things.

   - Kemeng Shi has added more userspace-visible writeback
     instrumentation in the series "Improve visibility of writeback".

   - Kemeng Shi then sent some maintenance work on top in the series
     "Fix and cleanups to page-writeback".

   - Matthew Wilcox reduces mmap_lock traffic in the anon vma code in
     the series "Improve anon_vma scalability for anon VMAs". Intel's
     test bot reported an improbable 3x improvement in one test.

   - SeongJae Park adds some DAMON feature work in the series
	"mm/damon: add a DAMOS filter type for page granularity access recheck"
	"selftests/damon: add DAMOS quota goal test"

   - Also some maintenance work in the series
	"mm/damon/paddr: simplify page level access re-check for pageout"
	"mm/damon: misc fixes and improvements"

   - David Hildenbrand has disabled some known-to-fail selftests ni the
     series "selftests: mm: cow: flag vmsplice() hugetlb tests as
     XFAIL".

   - memcg metadata storage optimizations from Shakeel Butt in "memcg:
     reduce memory consumption by memcg stats".

   - DAX fixes and maintenance work from Vishal Verma in the series
     "dax/bus.c: Fixups for dax-bus locking""

* tag 'mm-stable-2024-05-17-19-19' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (426 commits)
  memcg, oom: cleanup unused memcg_oom_gfp_mask and memcg_oom_order
  selftests/mm: hugetlb_madv_vs_map: avoid test skipping by querying hugepage size at runtime
  mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_wp
  mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_fault
  selftests: cgroup: add tests to verify the zswap writeback path
  mm: memcg: make alloc_mem_cgroup_per_node_info() return bool
  mm/damon/core: fix return value from damos_wmark_metric_value
  mm: do not update memcg stats for NR_{FILE/SHMEM}_PMDMAPPED
  selftests: cgroup: remove redundant enabling of memory controller
  Docs/mm/damon/maintainer-profile: allow posting patches based on damon/next tree
  Docs/mm/damon/maintainer-profile: change the maintainer's timezone from PST to PT
  Docs/mm/damon/design: use a list for supported filters
  Docs/admin-guide/mm/damon/usage: fix wrong schemes effective quota update command
  Docs/admin-guide/mm/damon/usage: fix wrong example of DAMOS filter matching sysfs file
  selftests/damon: classify tests for functionalities and regressions
  selftests/damon/_damon_sysfs: use 'is' instead of '==' for 'None'
  selftests/damon/_damon_sysfs: find sysfs mount point from /proc/mounts
  selftests/damon/_damon_sysfs: check errors from nr_schemes file reads
  mm/damon/core: initialize ->esz_bp from damos_quota_init_priv()
  selftests/damon: add a test for DAMOS quota goal
  ...
2024-05-19 09:21:03 -07:00

2176 lines
56 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0+
/*
* test_xarray.c: Test the XArray API
* Copyright (c) 2017-2018 Microsoft Corporation
* Copyright (c) 2019-2020 Oracle
* Author: Matthew Wilcox <willy@infradead.org>
*/
#include <linux/xarray.h>
#include <linux/module.h>
static unsigned int tests_run;
static unsigned int tests_passed;
static const unsigned int order_limit =
IS_ENABLED(CONFIG_XARRAY_MULTI) ? BITS_PER_LONG : 1;
#ifndef XA_DEBUG
# ifdef __KERNEL__
void xa_dump(const struct xarray *xa) { }
# endif
#undef XA_BUG_ON
#define XA_BUG_ON(xa, x) do { \
tests_run++; \
if (x) { \
printk("BUG at %s:%d\n", __func__, __LINE__); \
xa_dump(xa); \
dump_stack(); \
} else { \
tests_passed++; \
} \
} while (0)
#endif
static void *xa_mk_index(unsigned long index)
{
return xa_mk_value(index & LONG_MAX);
}
static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
return xa_store(xa, index, xa_mk_index(index), gfp);
}
static void xa_insert_index(struct xarray *xa, unsigned long index)
{
XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
GFP_KERNEL) != 0);
}
static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
u32 id;
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
gfp) != 0);
XA_BUG_ON(xa, id != index);
}
static void xa_erase_index(struct xarray *xa, unsigned long index)
{
XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, index) != NULL);
}
/*
* If anyone needs this, please move it to xarray.c. We have no current
* users outside the test suite because all current multislot users want
* to use the advanced API.
*/
static void *xa_store_order(struct xarray *xa, unsigned long index,
unsigned order, void *entry, gfp_t gfp)
{
XA_STATE_ORDER(xas, xa, index, order);
void *curr;
do {
xas_lock(&xas);
curr = xas_store(&xas, entry);
xas_unlock(&xas);
} while (xas_nomem(&xas, gfp));
return curr;
}
static noinline void check_xa_err(struct xarray *xa)
{
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
#ifndef __KERNEL__
/* The kernel does not fail GFP_NOWAIT allocations */
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
#endif
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
// kills the test-suite :-(
// XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
}
static noinline void check_xas_retry(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, 1, GFP_KERNEL);
rcu_read_lock();
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
xa_erase_index(xa, 1);
XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
XA_BUG_ON(xa, xas_retry(&xas, NULL));
XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
xas_reset(&xas);
XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_node != NULL);
rcu_read_unlock();
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
xas.xa_node = XAS_RESTART;
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
rcu_read_unlock();
/* Make sure we can iterate through retry entries */
xas_lock(&xas);
xas_set(&xas, 0);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 1);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 0);
xas_for_each(&xas, entry, ULONG_MAX) {
xas_store(&xas, xa_mk_index(xas.xa_index));
}
xas_unlock(&xas);
xa_erase_index(xa, 0);
xa_erase_index(xa, 1);
}
static noinline void check_xa_load(struct xarray *xa)
{
unsigned long i, j;
for (i = 0; i < 1024; i++) {
for (j = 0; j < 1024; j++) {
void *entry = xa_load(xa, j);
if (j < i)
XA_BUG_ON(xa, xa_to_value(entry) != j);
else
XA_BUG_ON(xa, entry);
}
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
}
for (i = 0; i < 1024; i++) {
for (j = 0; j < 1024; j++) {
void *entry = xa_load(xa, j);
if (j >= i)
XA_BUG_ON(xa, xa_to_value(entry) != j);
else
XA_BUG_ON(xa, entry);
}
xa_erase_index(xa, i);
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
{
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 8 : 1;
/* NULL elements have no marks set */
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
/* Storing a pointer will not make a mark appear */
XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
/* Setting one mark will not set another mark */
XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
/* Storing NULL clears marks, and they can't be set again */
xa_erase_index(xa, index);
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
/*
* Storing a multi-index entry over entries with marks gives the
* entire entry the union of the marks
*/
BUG_ON((index % 4) != 0);
for (order = 2; order < max_order; order++) {
unsigned long base = round_down(index, 1UL << order);
unsigned long next = base + (1UL << order);
unsigned long i;
XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
xa_set_mark(xa, index + 1, XA_MARK_0);
XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
xa_set_mark(xa, index + 2, XA_MARK_2);
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
xa_store_order(xa, index, order, xa_mk_index(index),
GFP_KERNEL);
for (i = base; i < next; i++) {
XA_STATE(xas, xa, i);
unsigned int seen = 0;
void *entry;
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
/* We should see two elements in the array */
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX)
seen++;
rcu_read_unlock();
XA_BUG_ON(xa, seen != 2);
/* One of which is marked */
xas_set(&xas, 0);
seen = 0;
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
seen++;
rcu_read_unlock();
XA_BUG_ON(xa, seen != 1);
}
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
xa_erase_index(xa, index);
xa_erase_index(xa, next);
XA_BUG_ON(xa, !xa_empty(xa));
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xa_mark_2(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long index;
unsigned int count = 0;
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_set_mark(xa, 0, XA_MARK_0);
xas_lock(&xas);
xas_load(&xas);
xas_init_marks(&xas);
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
for (index = 3500; index < 4500; index++) {
xa_store_index(xa, index, GFP_KERNEL);
xa_set_mark(xa, index, XA_MARK_0);
}
xas_reset(&xas);
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
count++;
rcu_read_unlock();
XA_BUG_ON(xa, count != 1000);
xas_lock(&xas);
xas_for_each(&xas, entry, ULONG_MAX) {
xas_init_marks(&xas);
XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
}
xas_unlock(&xas);
xa_destroy(xa);
}
static noinline void check_xa_mark_3(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
XA_STATE(xas, xa, 0x41);
void *entry;
int count = 0;
xa_store_order(xa, 0x40, 2, xa_mk_index(0x40), GFP_KERNEL);
xa_set_mark(xa, 0x41, XA_MARK_0);
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0) {
count++;
XA_BUG_ON(xa, entry != xa_mk_index(0x40));
}
XA_BUG_ON(xa, count != 1);
rcu_read_unlock();
xa_destroy(xa);
#endif
}
static noinline void check_xa_mark(struct xarray *xa)
{
unsigned long index;
for (index = 0; index < 16384; index += 4)
check_xa_mark_1(xa, index);
check_xa_mark_2(xa);
check_xa_mark_3(xa);
}
static noinline void check_xa_shrink(struct xarray *xa)
{
XA_STATE(xas, xa, 1);
struct xa_node *node;
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 15 : 1;
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
/*
* Check that erasing the entry at 1 shrinks the tree and properly
* marks the node as being deleted.
*/
xas_lock(&xas);
XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
node = xas.xa_node;
XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
XA_BUG_ON(xa, xas_load(&xas) != NULL);
xas_unlock(&xas);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
xa_erase_index(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
for (order = 0; order < max_order; order++) {
unsigned long max = (1UL << order) - 1;
xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
rcu_read_lock();
node = xa_head(xa);
rcu_read_unlock();
XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_head(xa) == node);
rcu_read_unlock();
XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, xa->xa_head != node);
xa_erase_index(xa, 0);
}
}
static noinline void check_insert(struct xarray *xa)
{
unsigned long i;
for (i = 0; i < 1024; i++) {
xa_insert_index(xa, i);
XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL);
xa_erase_index(xa, i);
}
for (i = 10; i < BITS_PER_LONG; i++) {
xa_insert_index(xa, 1UL << i);
XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL);
xa_erase_index(xa, 1UL << i);
xa_insert_index(xa, (1UL << i) - 1);
XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL);
XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL);
xa_erase_index(xa, (1UL << i) - 1);
}
xa_insert_index(xa, ~0UL);
XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL);
XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL);
xa_erase_index(xa, ~0UL);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_cmpxchg(struct xarray *xa)
{
void *FIVE = xa_mk_value(5);
void *SIX = xa_mk_value(6);
void *LOTS = xa_mk_value(12345678);
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != FIVE);
XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) == -EBUSY);
xa_erase_index(xa, 12345678);
xa_erase_index(xa, 5);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_cmpxchg_order(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
void *FIVE = xa_mk_value(5);
unsigned int i, order = 3;
XA_BUG_ON(xa, xa_store_order(xa, 0, order, FIVE, GFP_KERNEL));
/* Check entry FIVE has the order saved */
XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != order);
/* Check all the tied indexes have the same entry and order */
for (i = 0; i < (1 << order); i++) {
XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
XA_BUG_ON(xa, xa_get_order(xa, i) != order);
}
/* Ensure that nothing is stored at index '1 << order' */
XA_BUG_ON(xa, xa_load(xa, 1 << order) != NULL);
/*
* Additionally, keep the node information and the order at
* '1 << order'
*/
XA_BUG_ON(xa, xa_store_order(xa, 1 << order, order, FIVE, GFP_KERNEL));
for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
XA_BUG_ON(xa, xa_get_order(xa, i) != order);
}
/* Conditionally replace FIVE entry at index '0' with NULL */
XA_BUG_ON(xa, xa_cmpxchg(xa, 0, FIVE, NULL, GFP_KERNEL) != FIVE);
/* Verify the order is lost at FIVE (and old) entries */
XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != 0);
/* Verify the order and entries are lost in all the tied indexes */
for (i = 0; i < (1 << order); i++) {
XA_BUG_ON(xa, xa_load(xa, i) != NULL);
XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
}
/* Verify node and order are kept at '1 << order' */
for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) {
XA_BUG_ON(xa, xa_load(xa, i) != FIVE);
XA_BUG_ON(xa, xa_get_order(xa, i) != order);
}
xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static noinline void check_reserve(struct xarray *xa)
{
void *entry;
unsigned long index;
int count;
/* An array with a reserved entry is not empty */
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_load(xa, 12345678));
xa_release(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* Releasing a used entry does nothing */
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* cmpxchg sees a reserved entry as ZERO */
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
xa_mk_value(12345678), GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* xa_insert treats it as busy */
XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
-EBUSY);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
XA_BUG_ON(xa, !xa_empty(xa));
/* Can iterate through a reserved entry */
xa_store_index(xa, 5, GFP_KERNEL);
XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
xa_store_index(xa, 7, GFP_KERNEL);
count = 0;
xa_for_each(xa, index, entry) {
XA_BUG_ON(xa, index != 5 && index != 7);
count++;
}
XA_BUG_ON(xa, count != 2);
/* If we free a reserved entry, we should be able to allocate it */
if (xa->xa_flags & XA_FLAGS_ALLOC) {
u32 id;
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
XA_LIMIT(5, 10), GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 8);
xa_release(xa, 6);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
XA_LIMIT(5, 10), GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 6);
}
xa_destroy(xa);
}
static noinline void check_xas_erase(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
unsigned long i, j;
for (i = 0; i < 200; i++) {
for (j = i; j < 2 * i + 17; j++) {
xas_set(&xas, j);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_index(j));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
}
xas_set(&xas, ULONG_MAX);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
xas_lock(&xas);
xas_store(&xas, NULL);
xas_set(&xas, 0);
j = i;
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(j));
xas_store(&xas, NULL);
j++;
}
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
#ifdef CONFIG_XARRAY_MULTI
static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
unsigned long min = index & ~((1UL << order) - 1);
unsigned long max = min + (1UL << order);
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
xas_lock(&xas);
XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
xas_unlock(&xas);
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
xa_erase_index(xa, min);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL);
xas_lock(&xas);
XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_index != index);
XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, 0);
void *entry;
int n = 0;
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
xas_lock(&xas);
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(index));
n++;
}
XA_BUG_ON(xa, n != 1);
xas_set(&xas, index + 1);
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(index));
n++;
}
XA_BUG_ON(xa, n != 2);
xas_unlock(&xas);
xa_destroy(xa);
}
#endif
static noinline void check_multi_store(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long i, j, k;
unsigned int max_order = (sizeof(long) == 4) ? 30 : 60;
/* Loading from any position returns the same value */
xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
rcu_read_unlock();
/* Storing adjacent to the value does not alter the value */
xa_store(xa, 3, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
rcu_read_unlock();
/* Overwriting multiple indexes works */
xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
rcu_read_unlock();
/* We can erase multiple values with a single store */
xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
XA_BUG_ON(xa, !xa_empty(xa));
/* Even when the first slot is empty but the others aren't */
xa_store_index(xa, 1, GFP_KERNEL);
xa_store_index(xa, 2, GFP_KERNEL);
xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0; i < max_order; i++) {
for (j = 0; j < max_order; j++) {
xa_store_order(xa, 0, i, xa_mk_index(i), GFP_KERNEL);
xa_store_order(xa, 0, j, xa_mk_index(j), GFP_KERNEL);
for (k = 0; k < max_order; k++) {
void *entry = xa_load(xa, (1UL << k) - 1);
if ((i < k) && (j < k))
XA_BUG_ON(xa, entry != NULL);
else
XA_BUG_ON(xa, entry != xa_mk_index(j));
}
xa_erase(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
for (i = 0; i < 20; i++) {
check_multi_store_1(xa, 200, i);
check_multi_store_1(xa, 0, i);
check_multi_store_1(xa, (1UL << i) + 1, i);
}
check_multi_store_2(xa, 4095, 9);
for (i = 1; i < 20; i++) {
check_multi_store_3(xa, 0, i);
check_multi_store_3(xa, 1UL << i, i);
}
#endif
}
#ifdef CONFIG_XARRAY_MULTI
/* mimics page cache __filemap_add_folio() */
static noinline void check_xa_multi_store_adv_add(struct xarray *xa,
unsigned long index,
unsigned int order,
void *p)
{
XA_STATE(xas, xa, index);
unsigned int nrpages = 1UL << order;
/* users are responsible for index alignemnt to the order when adding */
XA_BUG_ON(xa, index & (nrpages - 1));
xas_set_order(&xas, index, order);
do {
xas_lock_irq(&xas);
xas_store(&xas, p);
xas_unlock_irq(&xas);
/*
* In our selftest case the only failure we can expect is for
* there not to be enough memory as we're not mimicking the
* entire page cache, so verify that's the only error we can run
* into here. The xas_nomem() which follows will ensure to fix
* that condition for us so to chug on on the loop.
*/
XA_BUG_ON(xa, xas_error(&xas) && xas_error(&xas) != -ENOMEM);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
XA_BUG_ON(xa, xa_load(xa, index) != p);
}
/* mimics page_cache_delete() */
static noinline void check_xa_multi_store_adv_del_entry(struct xarray *xa,
unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
xas_set_order(&xas, index, order);
xas_store(&xas, NULL);
xas_init_marks(&xas);
}
static noinline void check_xa_multi_store_adv_delete(struct xarray *xa,
unsigned long index,
unsigned int order)
{
xa_lock_irq(xa);
check_xa_multi_store_adv_del_entry(xa, index, order);
xa_unlock_irq(xa);
}
/* mimics page cache filemap_get_entry() */
static noinline void *test_get_entry(struct xarray *xa, unsigned long index)
{
XA_STATE(xas, xa, index);
void *p;
static unsigned int loops = 0;
rcu_read_lock();
repeat:
xas_reset(&xas);
p = xas_load(&xas);
if (xas_retry(&xas, p))
goto repeat;
rcu_read_unlock();
/*
* This is not part of the page cache, this selftest is pretty
* aggressive and does not want to trust the xarray API but rather
* test it, and for order 20 (4 GiB block size) we can loop over
* over a million entries which can cause a soft lockup. Page cache
* APIs won't be stupid, proper page cache APIs loop over the proper
* order so when using a larger order we skip shared entries.
*/
if (++loops % XA_CHECK_SCHED == 0)
schedule();
return p;
}
static unsigned long some_val = 0xdeadbeef;
static unsigned long some_val_2 = 0xdeaddead;
/* mimics the page cache usage */
static noinline void check_xa_multi_store_adv(struct xarray *xa,
unsigned long pos,
unsigned int order)
{
unsigned int nrpages = 1UL << order;
unsigned long index, base, next_index, next_next_index;
unsigned int i;
index = pos >> PAGE_SHIFT;
base = round_down(index, nrpages);
next_index = round_down(base + nrpages, nrpages);
next_next_index = round_down(next_index + nrpages, nrpages);
check_xa_multi_store_adv_add(xa, base, order, &some_val);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, base + i) != &some_val);
XA_BUG_ON(xa, test_get_entry(xa, next_index) != NULL);
/* Use order 0 for the next item */
check_xa_multi_store_adv_add(xa, next_index, 0, &some_val_2);
XA_BUG_ON(xa, test_get_entry(xa, next_index) != &some_val_2);
/* Remove the next item */
check_xa_multi_store_adv_delete(xa, next_index, 0);
/* Now use order for a new pointer */
check_xa_multi_store_adv_add(xa, next_index, order, &some_val_2);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
check_xa_multi_store_adv_delete(xa, next_index, order);
check_xa_multi_store_adv_delete(xa, base, order);
XA_BUG_ON(xa, !xa_empty(xa));
/* starting fresh again */
/* let's test some holes now */
/* hole at base and next_next */
check_xa_multi_store_adv_add(xa, next_index, order, &some_val_2);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != NULL);
check_xa_multi_store_adv_delete(xa, next_index, order);
XA_BUG_ON(xa, !xa_empty(xa));
/* hole at base and next */
check_xa_multi_store_adv_add(xa, next_next_index, order, &some_val_2);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != NULL);
for (i = 0; i < nrpages; i++)
XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != &some_val_2);
check_xa_multi_store_adv_delete(xa, next_next_index, order);
XA_BUG_ON(xa, !xa_empty(xa));
}
#endif
static noinline void check_multi_store_advanced(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
unsigned long end = ULONG_MAX/2;
unsigned long pos, i;
/*
* About 117 million tests below.
*/
for (pos = 7; pos < end; pos = (pos * pos) + 564) {
for (i = 0; i < max_order; i++) {
check_xa_multi_store_adv(xa, pos, i);
check_xa_multi_store_adv(xa, pos + 157, i);
}
}
#endif
}
static noinline void check_xa_alloc_1(struct xarray *xa, unsigned int base)
{
int i;
u32 id;
XA_BUG_ON(xa, !xa_empty(xa));
/* An empty array should assign %base to the first alloc */
xa_alloc_index(xa, base, GFP_KERNEL);
/* Erasing it should make the array empty again */
xa_erase_index(xa, base);
XA_BUG_ON(xa, !xa_empty(xa));
/* And it should assign %base again */
xa_alloc_index(xa, base, GFP_KERNEL);
/* Allocating and then erasing a lot should not lose base */
for (i = base + 1; i < 2 * XA_CHUNK_SIZE; i++)
xa_alloc_index(xa, i, GFP_KERNEL);
for (i = base; i < 2 * XA_CHUNK_SIZE; i++)
xa_erase_index(xa, i);
xa_alloc_index(xa, base, GFP_KERNEL);
/* Destroying the array should do the same as erasing */
xa_destroy(xa);
/* And it should assign %base again */
xa_alloc_index(xa, base, GFP_KERNEL);
/* The next assigned ID should be base+1 */
xa_alloc_index(xa, base + 1, GFP_KERNEL);
xa_erase_index(xa, base + 1);
/* Storing a value should mark it used */
xa_store_index(xa, base + 1, GFP_KERNEL);
xa_alloc_index(xa, base + 2, GFP_KERNEL);
/* If we then erase base, it should be free */
xa_erase_index(xa, base);
xa_alloc_index(xa, base, GFP_KERNEL);
xa_erase_index(xa, base + 1);
xa_erase_index(xa, base + 2);
for (i = 1; i < 5000; i++) {
xa_alloc_index(xa, base + i, GFP_KERNEL);
}
xa_destroy(xa);
/* Check that we fail properly at the limit of allocation */
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX - 1),
XA_LIMIT(UINT_MAX - 1, UINT_MAX),
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 0xfffffffeU);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX),
XA_LIMIT(UINT_MAX - 1, UINT_MAX),
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 0xffffffffU);
id = 3;
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(0),
XA_LIMIT(UINT_MAX - 1, UINT_MAX),
GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, id != 3);
xa_destroy(xa);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
GFP_KERNEL) != -EBUSY);
XA_BUG_ON(xa, xa_store_index(xa, 3, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
GFP_KERNEL) != -EBUSY);
xa_erase_index(xa, 3);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xa_alloc_2(struct xarray *xa, unsigned int base)
{
unsigned int i, id;
unsigned long index;
void *entry;
/* Allocate and free a NULL and check xa_empty() behaves */
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != base);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, id) != NULL);
XA_BUG_ON(xa, !xa_empty(xa));
/* Ditto, but check destroy instead of erase */
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != base);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = base; i < base + 10; i++) {
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b,
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != i);
}
XA_BUG_ON(xa, xa_store(xa, 3, xa_mk_index(3), GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store(xa, 4, xa_mk_index(4), GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store(xa, 4, NULL, GFP_KERNEL) != xa_mk_index(4));
XA_BUG_ON(xa, xa_erase(xa, 5) != NULL);
XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 5);
xa_for_each(xa, index, entry) {
xa_erase_index(xa, index);
}
for (i = base; i < base + 9; i++) {
XA_BUG_ON(xa, xa_erase(xa, i) != NULL);
XA_BUG_ON(xa, xa_empty(xa));
}
XA_BUG_ON(xa, xa_erase(xa, 8) != NULL);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, base + 9) != NULL);
XA_BUG_ON(xa, !xa_empty(xa));
xa_destroy(xa);
}
static noinline void check_xa_alloc_3(struct xarray *xa, unsigned int base)
{
struct xa_limit limit = XA_LIMIT(1, 0x3fff);
u32 next = 0;
unsigned int i, id;
unsigned long index;
void *entry;
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(1), limit,
&next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 1);
next = 0x3ffd;
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(0x3ffd), limit,
&next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != 0x3ffd);
xa_erase_index(xa, 0x3ffd);
xa_erase_index(xa, 1);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0x3ffe; i < 0x4003; i++) {
if (i < 0x4000)
entry = xa_mk_index(i);
else
entry = xa_mk_index(i - 0x3fff);
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, entry, limit,
&next, GFP_KERNEL) != (id == 1));
XA_BUG_ON(xa, xa_mk_index(id) != entry);
}
/* Check wrap-around is handled correctly */
if (base != 0)
xa_erase_index(xa, base);
xa_erase_index(xa, base + 1);
next = UINT_MAX;
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(UINT_MAX),
xa_limit_32b, &next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != UINT_MAX);
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base),
xa_limit_32b, &next, GFP_KERNEL) != 1);
XA_BUG_ON(xa, id != base);
XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base + 1),
xa_limit_32b, &next, GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != base + 1);
xa_for_each(xa, index, entry)
xa_erase_index(xa, index);
XA_BUG_ON(xa, !xa_empty(xa));
}
static DEFINE_XARRAY_ALLOC(xa0);
static DEFINE_XARRAY_ALLOC1(xa1);
static noinline void check_xa_alloc(void)
{
check_xa_alloc_1(&xa0, 0);
check_xa_alloc_1(&xa1, 1);
check_xa_alloc_2(&xa0, 0);
check_xa_alloc_2(&xa1, 1);
check_xa_alloc_3(&xa0, 0);
check_xa_alloc_3(&xa1, 1);
}
static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
unsigned int order, unsigned int present)
{
XA_STATE_ORDER(xas, xa, start, order);
void *entry;
unsigned int count = 0;
retry:
xas_lock(&xas);
xas_for_each_conflict(&xas, entry) {
XA_BUG_ON(xa, !xa_is_value(entry));
XA_BUG_ON(xa, entry < xa_mk_index(start));
XA_BUG_ON(xa, entry > xa_mk_index(start + (1UL << order) - 1));
count++;
}
xas_store(&xas, xa_mk_index(start));
xas_unlock(&xas);
if (xas_nomem(&xas, GFP_KERNEL)) {
count = 0;
goto retry;
}
XA_BUG_ON(xa, xas_error(&xas));
XA_BUG_ON(xa, count != present);
XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_index(start));
XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
xa_mk_index(start));
xa_erase_index(xa, start);
}
static noinline void check_store_iter(struct xarray *xa)
{
unsigned int i, j;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
for (i = 0; i < max_order; i++) {
unsigned int min = 1 << i;
unsigned int max = (2 << i) - 1;
__check_store_iter(xa, 0, i, 0);
XA_BUG_ON(xa, !xa_empty(xa));
__check_store_iter(xa, min, i, 0);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_index(xa, min, GFP_KERNEL);
__check_store_iter(xa, min, i, 1);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_index(xa, max, GFP_KERNEL);
__check_store_iter(xa, min, i, 1);
XA_BUG_ON(xa, !xa_empty(xa));
for (j = 0; j < min; j++)
xa_store_index(xa, j, GFP_KERNEL);
__check_store_iter(xa, 0, i, min);
XA_BUG_ON(xa, !xa_empty(xa));
for (j = 0; j < min; j++)
xa_store_index(xa, min + j, GFP_KERNEL);
__check_store_iter(xa, min, i, min);
XA_BUG_ON(xa, !xa_empty(xa));
}
#ifdef CONFIG_XARRAY_MULTI
xa_store_index(xa, 63, GFP_KERNEL);
xa_store_index(xa, 65, GFP_KERNEL);
__check_store_iter(xa, 64, 2, 1);
xa_erase_index(xa, 63);
#endif
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long multi = 3 << order;
unsigned long next = 4 << order;
unsigned long index;
xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
index = 0;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(multi));
XA_BUG_ON(xa, index != multi);
index = multi + 1;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(multi));
XA_BUG_ON(xa, (index < multi) || (index >= next));
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(next));
XA_BUG_ON(xa, index != next);
XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
XA_BUG_ON(xa, index != next);
xa_erase_index(xa, multi);
xa_erase_index(xa, next);
xa_erase_index(xa, next + 1);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static noinline void check_multi_find_2(struct xarray *xa)
{
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
unsigned int i, j;
void *entry;
for (i = 0; i < max_order; i++) {
unsigned long index = 1UL << i;
for (j = 0; j < index; j++) {
XA_STATE(xas, xa, j + index);
xa_store_index(xa, index - 1, GFP_KERNEL);
xa_store_order(xa, index, i, xa_mk_index(index),
GFP_KERNEL);
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
xa_erase_index(xa, index);
}
rcu_read_unlock();
xa_erase_index(xa, index - 1);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
}
static noinline void check_multi_find_3(struct xarray *xa)
{
unsigned int order;
for (order = 5; order < order_limit; order++) {
unsigned long index = 1UL << (order - 5);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
xa_erase_index(xa, 0);
}
}
static noinline void check_find_1(struct xarray *xa)
{
unsigned long i, j, k;
XA_BUG_ON(xa, !xa_empty(xa));
/*
* Check xa_find with all pairs between 0 and 99 inclusive,
* starting at every index between 0 and 99
*/
for (i = 0; i < 100; i++) {
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
xa_set_mark(xa, i, XA_MARK_0);
for (j = 0; j < i; j++) {
XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
NULL);
xa_set_mark(xa, j, XA_MARK_0);
for (k = 0; k < 100; k++) {
unsigned long index = k;
void *entry = xa_find(xa, &index, ULONG_MAX,
XA_PRESENT);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
index = k;
entry = xa_find(xa, &index, ULONG_MAX,
XA_MARK_0);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
}
xa_erase_index(xa, j);
XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
}
xa_erase_index(xa, i);
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_find_2(struct xarray *xa)
{
void *entry;
unsigned long i, j, index;
xa_for_each(xa, index, entry) {
XA_BUG_ON(xa, true);
}
for (i = 0; i < 1024; i++) {
xa_store_index(xa, index, GFP_KERNEL);
j = 0;
xa_for_each(xa, index, entry) {
XA_BUG_ON(xa, xa_mk_index(index) != entry);
XA_BUG_ON(xa, index != j++);
}
}
xa_destroy(xa);
}
static noinline void check_find_3(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long i, j, k;
void *entry;
for (i = 0; i < 100; i++) {
for (j = 0; j < 100; j++) {
rcu_read_lock();
for (k = 0; k < 100; k++) {
xas_set(&xas, j);
xas_for_each_marked(&xas, entry, k, XA_MARK_0)
;
if (j > k)
XA_BUG_ON(xa,
xas.xa_node != XAS_RESTART);
}
rcu_read_unlock();
}
xa_store_index(xa, i, GFP_KERNEL);
xa_set_mark(xa, i, XA_MARK_0);
}
xa_destroy(xa);
}
static noinline void check_find_4(struct xarray *xa)
{
unsigned long index = 0;
void *entry;
xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
XA_BUG_ON(xa, entry);
xa_erase_index(xa, ULONG_MAX);
}
static noinline void check_find(struct xarray *xa)
{
unsigned i;
check_find_1(xa);
check_find_2(xa);
check_find_3(xa);
check_find_4(xa);
for (i = 2; i < 10; i++)
check_multi_find_1(xa, i);
check_multi_find_2(xa);
check_multi_find_3(xa);
}
/* See find_swap_entry() in mm/shmem.c */
static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
{
XA_STATE(xas, xa, 0);
unsigned int checked = 0;
void *entry;
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
if (xas_retry(&xas, entry))
continue;
if (entry == item)
break;
checked++;
if ((checked % 4) != 0)
continue;
xas_pause(&xas);
}
rcu_read_unlock();
return entry ? xas.xa_index : -1;
}
static noinline void check_find_entry(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int order;
unsigned long offset, index;
for (order = 0; order < 20; order++) {
for (offset = 0; offset < (1UL << (order + 3));
offset += (1UL << order)) {
for (index = 0; index < (1UL << (order + 5));
index += (1UL << order)) {
xa_store_order(xa, index, order,
xa_mk_index(index), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, index) !=
xa_mk_index(index));
XA_BUG_ON(xa, xa_find_entry(xa,
xa_mk_index(index)) != index);
}
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
xa_destroy(xa);
}
}
#endif
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_index(ULONG_MAX)) != -1);
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_pause(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
unsigned int order;
unsigned long index = 1;
unsigned int count = 0;
for (order = 0; order < order_limit; order++) {
XA_BUG_ON(xa, xa_store_order(xa, index, order,
xa_mk_index(index), GFP_KERNEL));
index += 1UL << order;
}
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
count++;
}
rcu_read_unlock();
XA_BUG_ON(xa, count != order_limit);
count = 0;
xas_set(&xas, 0);
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
count++;
xas_pause(&xas);
}
rcu_read_unlock();
XA_BUG_ON(xa, count != order_limit);
xa_destroy(xa);
}
static noinline void check_move_tiny(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
rcu_read_lock();
XA_BUG_ON(xa, xas_next(&xas) != NULL);
XA_BUG_ON(xa, xas_next(&xas) != NULL);
rcu_read_unlock();
xa_store_index(xa, 0, GFP_KERNEL);
rcu_read_lock();
xas_set(&xas, 0);
XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0));
XA_BUG_ON(xa, xas_next(&xas) != NULL);
xas_set(&xas, 0);
XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0));
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
rcu_read_unlock();
xa_erase_index(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_move_max(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
rcu_read_lock();
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
rcu_read_unlock();
xas_set(&xas, 0);
rcu_read_lock();
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
xas_pause(&xas);
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
rcu_read_unlock();
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_move_small(struct xarray *xa, unsigned long idx)
{
XA_STATE(xas, xa, 0);
unsigned long i;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, idx, GFP_KERNEL);
rcu_read_lock();
for (i = 0; i < idx * 4; i++) {
void *entry = xas_next(&xas);
if (i <= idx)
XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
XA_BUG_ON(xa, xas.xa_index != i);
if (i == 0 || i == idx)
XA_BUG_ON(xa, entry != xa_mk_index(i));
else
XA_BUG_ON(xa, entry != NULL);
}
xas_next(&xas);
XA_BUG_ON(xa, xas.xa_index != i);
do {
void *entry = xas_prev(&xas);
i--;
if (i <= idx)
XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
XA_BUG_ON(xa, xas.xa_index != i);
if (i == 0 || i == idx)
XA_BUG_ON(xa, entry != xa_mk_index(i));
else
XA_BUG_ON(xa, entry != NULL);
} while (i > 0);
xas_set(&xas, ULONG_MAX);
XA_BUG_ON(xa, xas_next(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_index != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
rcu_read_unlock();
xa_erase_index(xa, 0);
xa_erase_index(xa, idx);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_move(struct xarray *xa)
{
XA_STATE(xas, xa, (1 << 16) - 1);
unsigned long i;
for (i = 0; i < (1 << 16); i++)
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
rcu_read_lock();
do {
void *entry = xas_prev(&xas);
i--;
XA_BUG_ON(xa, entry != xa_mk_index(i));
XA_BUG_ON(xa, i != xas.xa_index);
} while (i != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
do {
void *entry = xas_next(&xas);
XA_BUG_ON(xa, entry != xa_mk_index(i));
XA_BUG_ON(xa, i != xas.xa_index);
i++;
} while (i < (1 << 16));
rcu_read_unlock();
for (i = (1 << 8); i < (1 << 15); i++)
xa_erase_index(xa, i);
i = xas.xa_index;
rcu_read_lock();
do {
void *entry = xas_prev(&xas);
i--;
if ((i < (1 << 8)) || (i >= (1 << 15)))
XA_BUG_ON(xa, entry != xa_mk_index(i));
else
XA_BUG_ON(xa, entry != NULL);
XA_BUG_ON(xa, i != xas.xa_index);
} while (i != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
do {
void *entry = xas_next(&xas);
if ((i < (1 << 8)) || (i >= (1 << 15)))
XA_BUG_ON(xa, entry != xa_mk_index(i));
else
XA_BUG_ON(xa, entry != NULL);
XA_BUG_ON(xa, i != xas.xa_index);
i++;
} while (i < (1 << 16));
rcu_read_unlock();
xa_destroy(xa);
check_move_tiny(xa);
check_move_max(xa);
for (i = 0; i < 16; i++)
check_move_small(xa, 1UL << i);
for (i = 2; i < 16; i++)
check_move_small(xa, (1UL << i) - 1);
}
static noinline void xa_store_many_order(struct xarray *xa,
unsigned long index, unsigned order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned int i = 0;
do {
xas_lock(&xas);
XA_BUG_ON(xa, xas_find_conflict(&xas));
xas_create_range(&xas);
if (xas_error(&xas))
goto unlock;
for (i = 0; i < (1U << order); i++) {
XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i)));
xas_next(&xas);
}
unlock:
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
}
static noinline void check_create_range_1(struct xarray *xa,
unsigned long index, unsigned order)
{
unsigned long i;
xa_store_many_order(xa, index, order);
for (i = index; i < index + (1UL << order); i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_2(struct xarray *xa, unsigned order)
{
unsigned long i;
unsigned long nr = 1UL << order;
for (i = 0; i < nr * nr; i += nr)
xa_store_many_order(xa, i, order);
for (i = 0; i < nr * nr; i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_3(void)
{
XA_STATE(xas, NULL, 0);
xas_set_err(&xas, -EEXIST);
xas_create_range(&xas);
XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST);
}
static noinline void check_create_range_4(struct xarray *xa,
unsigned long index, unsigned order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned long base = xas.xa_index;
unsigned long i = 0;
xa_store_index(xa, index, GFP_KERNEL);
do {
xas_lock(&xas);
xas_create_range(&xas);
if (xas_error(&xas))
goto unlock;
for (i = 0; i < (1UL << order); i++) {
void *old = xas_store(&xas, xa_mk_index(base + i));
if (xas.xa_index == index)
XA_BUG_ON(xa, old != xa_mk_index(base + i));
else
XA_BUG_ON(xa, old != NULL);
xas_next(&xas);
}
unlock:
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
for (i = base; i < base + (1UL << order); i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_5(struct xarray *xa,
unsigned long index, unsigned int order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned int i;
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
for (i = 0; i < order + 10; i++) {
do {
xas_lock(&xas);
xas_create_range(&xas);
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
}
xa_destroy(xa);
}
static noinline void check_create_range(struct xarray *xa)
{
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
for (order = 0; order < max_order; order++) {
check_create_range_1(xa, 0, order);
check_create_range_1(xa, 1U << order, order);
check_create_range_1(xa, 2U << order, order);
check_create_range_1(xa, 3U << order, order);
check_create_range_1(xa, 1U << 24, order);
if (order < 10)
check_create_range_2(xa, order);
check_create_range_4(xa, 0, order);
check_create_range_4(xa, 1U << order, order);
check_create_range_4(xa, 2U << order, order);
check_create_range_4(xa, 3U << order, order);
check_create_range_4(xa, 1U << 24, order);
check_create_range_4(xa, 1, order);
check_create_range_4(xa, (1U << order) + 1, order);
check_create_range_4(xa, (2U << order) + 1, order);
check_create_range_4(xa, (2U << order) - 1, order);
check_create_range_4(xa, (3U << order) + 1, order);
check_create_range_4(xa, (3U << order) - 1, order);
check_create_range_4(xa, (1U << 24) + 1, order);
check_create_range_5(xa, 0, order);
check_create_range_5(xa, (1U << order), order);
}
check_create_range_3();
}
static noinline void __check_store_range(struct xarray *xa, unsigned long first,
unsigned long last)
{
#ifdef CONFIG_XARRAY_MULTI
xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first));
XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first));
XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
xa_store_range(xa, first, last, NULL, GFP_KERNEL);
#endif
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_store_range(struct xarray *xa)
{
unsigned long i, j;
for (i = 0; i < 128; i++) {
for (j = i; j < 128; j++) {
__check_store_range(xa, i, j);
__check_store_range(xa, 128 + i, 128 + j);
__check_store_range(xa, 4095 + i, 4095 + j);
__check_store_range(xa, 4096 + i, 4096 + j);
__check_store_range(xa, 123456 + i, 123456 + j);
__check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
}
}
}
#ifdef CONFIG_XARRAY_MULTI
static void check_split_1(struct xarray *xa, unsigned long index,
unsigned int order, unsigned int new_order)
{
XA_STATE_ORDER(xas, xa, index, new_order);
unsigned int i, found;
void *entry;
xa_store_order(xa, index, order, xa, GFP_KERNEL);
xa_set_mark(xa, index, XA_MARK_1);
xas_split_alloc(&xas, xa, order, GFP_KERNEL);
xas_lock(&xas);
xas_split(&xas, xa, order);
for (i = 0; i < (1 << order); i += (1 << new_order))
__xa_store(xa, index + i, xa_mk_index(index + i), 0);
xas_unlock(&xas);
for (i = 0; i < (1 << order); i++) {
unsigned int val = index + (i & ~((1 << new_order) - 1));
XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
}
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
xas_set_order(&xas, index, 0);
found = 0;
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_1) {
found++;
XA_BUG_ON(xa, xa_is_internal(entry));
}
rcu_read_unlock();
XA_BUG_ON(xa, found != 1 << (order - new_order));
xa_destroy(xa);
}
static noinline void check_split(struct xarray *xa)
{
unsigned int order, new_order;
XA_BUG_ON(xa, !xa_empty(xa));
for (order = 1; order < 2 * XA_CHUNK_SHIFT; order++) {
for (new_order = 0; new_order < order; new_order++) {
check_split_1(xa, 0, order, new_order);
check_split_1(xa, 1UL << order, order, new_order);
check_split_1(xa, 3UL << order, order, new_order);
}
}
}
#else
static void check_split(struct xarray *xa) { }
#endif
static void check_align_1(struct xarray *xa, char *name)
{
int i;
unsigned int id;
unsigned long index;
void *entry;
for (i = 0; i < 8; i++) {
XA_BUG_ON(xa, xa_alloc(xa, &id, name + i, xa_limit_32b,
GFP_KERNEL) != 0);
XA_BUG_ON(xa, id != i);
}
xa_for_each(xa, index, entry)
XA_BUG_ON(xa, xa_is_err(entry));
xa_destroy(xa);
}
/*
* We should always be able to store without allocating memory after
* reserving a slot.
*/
static void check_align_2(struct xarray *xa, char *name)
{
int i;
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0; i < 8; i++) {
XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL);
xa_erase(xa, 0);
}
for (i = 0; i < 8; i++) {
XA_BUG_ON(xa, xa_reserve(xa, 0, GFP_KERNEL) != 0);
XA_BUG_ON(xa, xa_store(xa, 0, name + i, 0) != NULL);
xa_erase(xa, 0);
}
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_align(struct xarray *xa)
{
char name[] = "Motorola 68000";
check_align_1(xa, name);
check_align_1(xa, name + 1);
check_align_1(xa, name + 2);
check_align_1(xa, name + 3);
check_align_2(xa, name);
}
static LIST_HEAD(shadow_nodes);
static void test_update_node(struct xa_node *node)
{
if (node->count && node->count == node->nr_values) {
if (list_empty(&node->private_list))
list_add(&shadow_nodes, &node->private_list);
} else {
if (!list_empty(&node->private_list))
list_del_init(&node->private_list);
}
}
static noinline void shadow_remove(struct xarray *xa)
{
struct xa_node *node;
xa_lock(xa);
while ((node = list_first_entry_or_null(&shadow_nodes,
struct xa_node, private_list))) {
XA_BUG_ON(xa, node->array != xa);
list_del_init(&node->private_list);
xa_delete_node(node, test_update_node);
}
xa_unlock(xa);
}
static noinline void check_workingset(struct xarray *xa, unsigned long index)
{
XA_STATE(xas, xa, index);
xas_set_update(&xas, test_update_node);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_next(&xas);
xas_store(&xas, xa_mk_value(1));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, list_empty(&shadow_nodes));
xas_lock(&xas);
xas_next(&xas);
xas_store(&xas, &xas);
XA_BUG_ON(xa, !list_empty(&shadow_nodes));
xas_store(&xas, xa_mk_value(2));
xas_unlock(&xas);
XA_BUG_ON(xa, list_empty(&shadow_nodes));
shadow_remove(xa);
XA_BUG_ON(xa, !list_empty(&shadow_nodes));
XA_BUG_ON(xa, !xa_empty(xa));
}
/*
* Check that the pointer / value / sibling entries are accounted the
* way we expect them to be.
*/
static noinline void check_account(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int order;
for (order = 1; order < 12; order++) {
XA_STATE(xas, xa, 1 << order);
xa_store_order(xa, 0, order, xa, GFP_KERNEL);
rcu_read_lock();
xas_load(&xas);
XA_BUG_ON(xa, xas.xa_node->count == 0);
XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
rcu_read_unlock();
xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order),
GFP_KERNEL);
XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
xa_erase(xa, 1 << order);
XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
xa_erase(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
#endif
}
static noinline void check_get_order(struct xarray *xa)
{
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
unsigned int order;
unsigned long i, j;
for (i = 0; i < 3; i++)
XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
for (order = 0; order < max_order; order++) {
for (i = 0; i < 10; i++) {
xa_store_order(xa, i << order, order,
xa_mk_index(i << order), GFP_KERNEL);
for (j = i << order; j < (i + 1) << order; j++)
XA_BUG_ON(xa, xa_get_order(xa, j) != order);
xa_erase(xa, i << order);
}
}
}
static noinline void check_xas_get_order(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
unsigned int order;
unsigned long i, j;
for (order = 0; order < max_order; order++) {
for (i = 0; i < 10; i++) {
xas_set_order(&xas, i << order, order);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(i));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
for (j = i << order; j < (i + 1) << order; j++) {
xas_set_order(&xas, j, 0);
rcu_read_lock();
xas_load(&xas);
XA_BUG_ON(xa, xas_get_order(&xas) != order);
rcu_read_unlock();
}
xas_lock(&xas);
xas_set_order(&xas, i << order, order);
xas_store(&xas, NULL);
xas_unlock(&xas);
}
}
}
static noinline void check_xas_conflict_get_order(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
int only_once;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
unsigned int order;
unsigned long i, j, k;
for (order = 0; order < max_order; order++) {
for (i = 0; i < 10; i++) {
xas_set_order(&xas, i << order, order);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(i));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
/*
* Ensure xas_get_order works with xas_for_each_conflict.
*/
j = i << order;
for (k = 0; k < order; k++) {
only_once = 0;
xas_set_order(&xas, j + (1 << k), k);
xas_lock(&xas);
xas_for_each_conflict(&xas, entry) {
XA_BUG_ON(xa, entry != xa_mk_value(i));
XA_BUG_ON(xa, xas_get_order(&xas) != order);
only_once++;
}
XA_BUG_ON(xa, only_once != 1);
xas_unlock(&xas);
}
if (order < max_order - 1) {
only_once = 0;
xas_set_order(&xas, (i & ~1UL) << order, order + 1);
xas_lock(&xas);
xas_for_each_conflict(&xas, entry) {
XA_BUG_ON(xa, entry != xa_mk_value(i));
XA_BUG_ON(xa, xas_get_order(&xas) != order);
only_once++;
}
XA_BUG_ON(xa, only_once != 1);
xas_unlock(&xas);
}
xas_set_order(&xas, i << order, order);
xas_lock(&xas);
xas_store(&xas, NULL);
xas_unlock(&xas);
}
}
}
static noinline void check_destroy(struct xarray *xa)
{
unsigned long index;
XA_BUG_ON(xa, !xa_empty(xa));
/* Destroying an empty array is a no-op */
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
/* Destroying an array with a single entry */
for (index = 0; index < 1000; index++) {
xa_store_index(xa, index, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
}
/* Destroying an array with a single entry at ULONG_MAX */
xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
#ifdef CONFIG_XARRAY_MULTI
/* Destroying an array with a multi-index entry */
xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static DEFINE_XARRAY(array);
static int xarray_checks(void)
{
check_xa_err(&array);
check_xas_retry(&array);
check_xa_load(&array);
check_xa_mark(&array);
check_xa_shrink(&array);
check_xas_erase(&array);
check_insert(&array);
check_cmpxchg(&array);
check_cmpxchg_order(&array);
check_reserve(&array);
check_reserve(&xa0);
check_multi_store(&array);
check_multi_store_advanced(&array);
check_get_order(&array);
check_xas_get_order(&array);
check_xas_conflict_get_order(&array);
check_xa_alloc();
check_find(&array);
check_find_entry(&array);
check_pause(&array);
check_account(&array);
check_destroy(&array);
check_move(&array);
check_create_range(&array);
check_store_range(&array);
check_store_iter(&array);
check_align(&xa0);
check_split(&array);
check_workingset(&array, 0);
check_workingset(&array, 64);
check_workingset(&array, 4096);
printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
return (tests_run == tests_passed) ? 0 : -EINVAL;
}
static void xarray_exit(void)
{
}
module_init(xarray_checks);
module_exit(xarray_exit);
MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
MODULE_LICENSE("GPL");
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