linux-kernel - [PATCH] kmemleak: Reduce verbosity when memory allocation fails

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Date:	Mon, 10 Jan 2011 18:11:33 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Toralf Förster <toralf.foerster@....de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Ted Ts'o <tytso@....edu>, David Rientjes <rientjes@...gle.com>
Subject: [PATCH] kmemleak: Reduce verbosity when memory allocation fails

This patch changes the kmemleak verbosity to avoid dumping the stack
trace when memory allocation for the kmemleak internal metadata fails.
It also passes __GFP_NOWARN to the slab allocator.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Reported-by: Toralf Förster <toralf.foerster@....de>
Cc: Pekka Enberg <penberg@...helsinki.fi>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Ted Ts'o <tytso@....edu>
---
 mm/kmemleak.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index bd9bc21..eee8e31 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -113,7 +113,8 @@
 #define BYTES_PER_POINTER	sizeof(void *)
 
 /* GFP bitmask for kmemleak internal allocations */
-#define GFP_KMEMLEAK_MASK	(GFP_KERNEL | GFP_ATOMIC)
+#define gfp_kmemleak_mask(gfp)	((gfp) & (GFP_KERNEL | GFP_ATOMIC) | \
+				 __GFP_NOWARN)
 
 /* scanning area inside a memory block */
 struct kmemleak_scan_area {
@@ -511,9 +512,10 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
 	struct kmemleak_object *object;
 	struct prio_tree_node *node;
 
-	object = kmem_cache_alloc(object_cache, gfp & GFP_KMEMLEAK_MASK);
+	object = kmem_cache_alloc(object_cache, gfp_kmemleak_mask(gfp));
 	if (!object) {
-		kmemleak_stop("Cannot allocate a kmemleak_object structure\n");
+		pr_warning("Cannot allocate a kmemleak_object structure\n");
+		kmemleak_disable();
 		return NULL;
 	}
 
@@ -734,9 +736,9 @@ static void add_scan_area(unsigned long ptr, size_t size, gfp_t gfp)
 		return;
 	}
 
-	area = kmem_cache_alloc(scan_area_cache, gfp & GFP_KMEMLEAK_MASK);
+	area = kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp));
 	if (!area) {
-		kmemleak_warn("Cannot allocate a scan area\n");
+		pr_warning("Cannot allocate a scan area\n");
 		goto out;
 	}
 


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