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mm: cleanup the gfp_mask handling in __vmalloc_area_node

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Patch series "two small vmalloc cleanups".

This patch (of 2):

__vmalloc_area_node currently has four different gfp_t variables to
just express this simple logic:

 - use the passed in mask, plus __GFP_NOWARN and __GFP_HIGHMEM (if
   suitable) for the underlying page allocation
 - use just the reclaim flags from the passed in mask plus __GFP_ZERO
   for allocating the page array

Simplify this down to just use the pre-existing nested_gfp as-is for
the page array allocation, and just the passed in gfp_mask for the
page allocation, after conditionally ORing __GFP_HIGHMEM into it.  This
also makes the allocation warning a little more correct.

Also initialize two variables at the time of declaration while touching
this area.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Link: https://lkml.kernel.org/r/20201002124035.1539300-1-hch@lst.de
Link: https://lkml.kernel.org/r/20201002124035.1539300-2-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-10-17 16:15:43 -07:00 committed by Linus Torvalds
parent 301fa9f2dd
commit f255935b97
1 changed files with 10 additions and 12 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

22
mm/vmalloc.c
View file

@ -2461,21 +2461,19 @@ EXPORT_SYMBOL_GPL(vmap_pfn);
static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
pgprot_t prot, int node) pgprot_t prot, int node)
{ {
struct page **pages;
unsigned int nr_pages, array_size, i;
const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO; const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN; unsigned int nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
const gfp_t highmem_mask = (gfp_mask & (GFP_DMA | GFP_DMA32)) ? unsigned int array_size = nr_pages * sizeof(struct page *), i;
0 : struct page **pages;
__GFP_HIGHMEM;
nr_pages = get_vm_area_size(area) >> PAGE_SHIFT; gfp_mask |= __GFP_NOWARN;
array_size = (nr_pages * sizeof(struct page *)); if (!(gfp_mask & (GFP_DMA | GFP_DMA32)))
gfp_mask |= __GFP_HIGHMEM;
/* Please note that the recursion is strictly bounded. */ /* Please note that the recursion is strictly bounded. */
if (array_size > PAGE_SIZE) { if (array_size > PAGE_SIZE) {
pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask, pages = __vmalloc_node(array_size, 1, nested_gfp, node,
node, area->caller); area->caller);
} else { } else {
pages = kmalloc_node(array_size, nested_gfp, node); pages = kmalloc_node(array_size, nested_gfp, node);
} }
@ -2493,9 +2491,9 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
struct page *page; struct page *page;
if (node == NUMA_NO_NODE) if (node == NUMA_NO_NODE)
page = alloc_page(alloc_mask|highmem_mask); page = alloc_page(gfp_mask);
else else
page = alloc_pages_node(node, alloc_mask|highmem_mask, 0); page = alloc_pages_node(node, gfp_mask, 0);
if (unlikely(!page)) { if (unlikely(!page)) {
/* Successfully allocated i pages, free them in __vfree() */ /* Successfully allocated i pages, free them in __vfree() */