diff options
author | Catalin Marinas <catalin.marinas@arm.com> | 2014-06-06 14:38:17 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-06 16:08:17 -0700 |
commit | ffe2c748e283c5dc1b9b9ac116299dbfc11a609b (patch) | |
tree | ef16269fb598e941c9e0c90004a8cc20f2133760 /mm | |
parent | aae0ad7ae5a997bff1862e6e5eebed39cdf08ff3 (diff) | |
download | op-kernel-dev-ffe2c748e283c5dc1b9b9ac116299dbfc11a609b.zip op-kernel-dev-ffe2c748e283c5dc1b9b9ac116299dbfc11a609b.tar.gz |
mm: introduce kmemleak_update_trace()
The memory allocation stack trace is not always useful for debugging a
memory leak (e.g. radix_tree_preload). This function, when called,
updates the stack trace for an already allocated object.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/kmemleak.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 5d4aec4..3cda50c 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -990,6 +990,40 @@ void __ref kmemleak_free_percpu(const void __percpu *ptr) EXPORT_SYMBOL_GPL(kmemleak_free_percpu); /** + * kmemleak_update_trace - update object allocation stack trace + * @ptr: pointer to beginning of the object + * + * Override the object allocation stack trace for cases where the actual + * allocation place is not always useful. + */ +void __ref kmemleak_update_trace(const void *ptr) +{ + struct kmemleak_object *object; + unsigned long flags; + + pr_debug("%s(0x%p)\n", __func__, ptr); + + if (!kmemleak_enabled || IS_ERR_OR_NULL(ptr)) + return; + + object = find_and_get_object((unsigned long)ptr, 1); + if (!object) { +#ifdef DEBUG + kmemleak_warn("Updating stack trace for unknown object at %p\n", + ptr); +#endif + return; + } + + spin_lock_irqsave(&object->lock, flags); + object->trace_len = __save_stack_trace(object->trace); + spin_unlock_irqrestore(&object->lock, flags); + + put_object(object); +} +EXPORT_SYMBOL(kmemleak_update_trace); + +/** * kmemleak_not_leak - mark an allocated object as false positive * @ptr: pointer to beginning of the object * |