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samples: kmemleak: print the raw pointers for debugging purposes

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The kmemleak-test.c module is meant to leak some pointers for debugging
the kmemleak detection, pointer information dumping.  It's no use if it
prints the hashed values of such pointers.

Change the printk() format from %p to %px.  While at it, also display the
raw __percpu pointer rather than this_cpu_ptr() since kmemleak now tracks
such pointers independently of the standard allocations.

Link: https://lkml.kernel.org/r/20250206114537.2597764-3-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Catalin Marinas 2025-02-06 11:45:37 +00:00 committed by Andrew Morton
parent 7ddeb91f5b
commit fe1136b4cc
1 changed files with 18 additions and 18 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

36
samples/kmemleak/kmemleak-test.c
View file

@ -40,25 +40,25 @@ static int kmemleak_test_init(void)
pr_info("Kmemleak testing\n");
/* make some orphan objects */
pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
pr_info("kmalloc(32) = 0x%px\n", kmalloc(32, GFP_KERNEL));
pr_info("kmalloc(32) = 0x%px\n", kmalloc(32, GFP_KERNEL));
pr_info("kmalloc(1024) = 0x%px\n", kmalloc(1024, GFP_KERNEL));
pr_info("kmalloc(1024) = 0x%px\n", kmalloc(1024, GFP_KERNEL));
pr_info("kmalloc(2048) = 0x%px\n", kmalloc(2048, GFP_KERNEL));
pr_info("kmalloc(2048) = 0x%px\n", kmalloc(2048, GFP_KERNEL));
pr_info("kmalloc(4096) = 0x%px\n", kmalloc(4096, GFP_KERNEL));
pr_info("kmalloc(4096) = 0x%px\n", kmalloc(4096, GFP_KERNEL));
#ifndef CONFIG_MODULES
pr_info("kmem_cache_alloc(files_cachep) = %p\n",
pr_info("kmem_cache_alloc(files_cachep) = 0x%px\n",
kmem_cache_alloc(files_cachep, GFP_KERNEL));
pr_info("kmem_cache_alloc(files_cachep) = %p\n",
pr_info("kmem_cache_alloc(files_cachep) = 0x%px\n",
kmem_cache_alloc(files_cachep, GFP_KERNEL));
#endif
pr_info("vmalloc(64) = %p\n", vmalloc(64));
pr_info("vmalloc(64) = %p\n", vmalloc(64));
pr_info("vmalloc(64) = %p\n", vmalloc(64));
pr_info("vmalloc(64) = %p\n", vmalloc(64));
pr_info("vmalloc(64) = %p\n", vmalloc(64));
pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
pr_info("vmalloc(64) = 0x%px\n", vmalloc(64));
/*
* Add elements to a list. They should only appear as orphan
@ -66,7 +66,7 @@ static int kmemleak_test_init(void)
*/
for (i = 0; i < 10; i++) {
elem = kzalloc(sizeof(*elem), GFP_KERNEL);
pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
pr_info("kzalloc(sizeof(*elem)) = 0x%px\n", elem);
if (!elem)
return -ENOMEM;
INIT_LIST_HEAD(&elem->list);
@ -75,11 +75,11 @@ static int kmemleak_test_init(void)
for_each_possible_cpu(i) {
per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
pr_info("kmalloc(129) = %p\n",
pr_info("kmalloc(129) = 0x%px\n",
per_cpu(kmemleak_test_pointer, i));
}
pr_info("__alloc_percpu(64, 4) = %p\n", __alloc_percpu(64, 4));
pr_info("__alloc_percpu(64, 4) = 0x%px\n", __alloc_percpu(64, 4));
return 0;
}