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Subject[tip:tracing/kmemtrace-v2] kmemtrace: trace kfree() calls with NULL or zero-length objects
Commit-ID:  2121db74ba0fd2259f0e2265511684fadda9ac49
Gitweb: http://git.kernel.org/tip/2121db74ba0fd2259f0e2265511684fadda9ac49
Author: Pekka Enberg <penberg@cs.helsinki.fi>
AuthorDate: Wed, 25 Mar 2009 11:05:57 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 3 Apr 2009 12:23:10 +0200

kmemtrace: trace kfree() calls with NULL or zero-length objects

Impact: also output kfree(NULL) entries

This patch moves the trace_kfree() calls before the ZERO_OR_NULL_PTR
check so that we can trace call-sites that call kfree() with NULL many
times which might be an indication of a bug.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
LKML-Reference: <1237971957.30175.18.camel@penberg-laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
mm/slab.c | 4 ++--
mm/slob.c | 4 ++--
mm/slub.c | 4 ++--
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index fa00fd6..b584002 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3773,6 +3773,8 @@ void kfree(const void *objp)
struct kmem_cache *c;
unsigned long flags;

+ trace_kfree(_RET_IP_, objp);
+
if (unlikely(ZERO_OR_NULL_PTR(objp)))
return;
local_irq_save(flags);
@@ -3782,8 +3784,6 @@ void kfree(const void *objp)
debug_check_no_obj_freed(objp, obj_size(c));
__cache_free(c, (void *)objp);
local_irq_restore(flags);
-
- trace_kfree(_RET_IP_, objp);
}
EXPORT_SYMBOL(kfree);

diff --git a/mm/slob.c b/mm/slob.c
index 0000358..a2d4ab3 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -514,6 +514,8 @@ void kfree(const void *block)
{
struct slob_page *sp;

+ trace_kfree(_RET_IP_, block);
+
if (unlikely(ZERO_OR_NULL_PTR(block)))
return;

@@ -524,8 +526,6 @@ void kfree(const void *block)
slob_free(m, *m + align);
} else
put_page(&sp->page);
-
- trace_kfree(_RET_IP_, block);
}
EXPORT_SYMBOL(kfree);

diff --git a/mm/slub.c b/mm/slub.c
index a98078b..7ab54ec 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2792,6 +2792,8 @@ void kfree(const void *x)
struct page *page;
void *object = (void *)x;

+ trace_kfree(_RET_IP_, x);
+
if (unlikely(ZERO_OR_NULL_PTR(x)))
return;

@@ -2802,8 +2804,6 @@ void kfree(const void *x)
return;
}
slab_free(page->slab, page, object, _RET_IP_);
-
- trace_kfree(_RET_IP_, x);
}
EXPORT_SYMBOL(kfree);


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