The patch titled
Subject: samples: kmemleak: print the raw pointers for debugging purposes
has been added to the -mm mm-unstable branch. Its filename is
samples-kmemleak-print-the-raw-pointers-for-debugging-purposes.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/samples-kmemleak-print-the-raw-pointers-for-debugging-purposes.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Subject: samples: kmemleak: print the raw pointers for debugging purposes
Date: Thu, 6 Feb 2025 11:45:37 +0000
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@xxxxxxx
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
samples/kmemleak/kmemleak-test.c | 36 ++++++++++++++---------------
1 file changed, 18 insertions(+), 18 deletions(-)
--- a/samples/kmemleak/kmemleak-test.c~samples-kmemleak-print-the-raw-pointers-for-debugging-purposes
+++ a/samples/kmemleak/kmemleak-test.c
@@ -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;
}
_
Patches currently in -mm which might be from catalin.marinas@xxxxxxx are
mm-kmemleak-add-support-for-dumping-physical-and-__percpu-object-info.patch
samples-kmemleak-print-the-raw-pointers-for-debugging-purposes.patch
