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authorAkinobu Mita <akinobu.mita@gmail.com>2007-05-06 14:49:58 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:55 -0700
commit824ebef122153a03925ae0ed211b4e8568d1c8db (patch)
tree2a9ce9acc187b6a6985064c773cbf850ad405a07
parentf0f3980b21508bd573eff1746d469436f50a903d (diff)
fault injection: fix failslab with CONFIG_NUMA
Currently failslab injects failures into ____cache_alloc(). But with enabling CONFIG_NUMA it's not enough to let actual slab allocator functions (kmalloc, kmem_cache_alloc, ...) return NULL. This patch moves fault injection hook inside of __cache_alloc() and __cache_alloc_node(). These are lower call path than ____cache_alloc() and enable to inject faulures to slab allocators with CONFIG_NUMA. Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 583644f6ae11..2a3cbd6e675d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3170,7 +3170,7 @@ static int __init failslab_debugfs(void)
struct dentry *dir;
int err;
- err = init_fault_attr_dentries(&failslab.attr, "failslab");
+ err = init_fault_attr_dentries(&failslab.attr, "failslab");
if (err)
return err;
dir = failslab.attr.dentries.dir;
@@ -3208,9 +3208,6 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags)
check_irq_off();
- if (should_failslab(cachep, flags))
- return NULL;
-
ac = cpu_cache_get(cachep);
if (likely(ac->avail)) {
STATS_INC_ALLOCHIT(cachep);
@@ -3402,6 +3399,9 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
unsigned long save_flags;
void *ptr;
+ if (should_failslab(cachep, flags))
+ return NULL;
+
cache_alloc_debugcheck_before(cachep, flags);
local_irq_save(save_flags);
@@ -3472,6 +3472,9 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
unsigned long save_flags;
void *objp;
+ if (should_failslab(cachep, flags))
+ return NULL;
+
cache_alloc_debugcheck_before(cachep, flags);
local_irq_save(save_flags);
objp = __do_cache_alloc(cachep, flags);

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