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authorCatalin Marinas <catalin.marinas@arm.com>2014-06-06 14:38:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-06 16:08:17 -0700
commitffe2c748e283c5dc1b9b9ac116299dbfc11a609b (patch)
treeef16269fb598e941c9e0c90004a8cc20f2133760 /mm/kmemleak.c
parentaae0ad7ae5a997bff1862e6e5eebed39cdf08ff3 (diff)
downloadop-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/kmemleak.c')
-rw-r--r--mm/kmemleak.c34
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
*
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