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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>
hifive-unleashed-5.1
Akinobu Mita 2007-05-06 14:49:58 -07:00 committed by Linus Torvalds
parent f0f3980b21
commit 824ebef122
1 changed files with 7 additions and 4 deletions
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11
mm/slab.c
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@ -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);