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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2016-05-19 17:10:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 19:12:14 -0700
commit8888177ea116d4d14ca0a2ba054d02f35b0dae29 (patch)
tree857ced651deb6b5c91a94a635fdc24aba0a81c43
parent18726ca8b34bbfb3ab5a1c0a52a5d8dd392466ed (diff)
mm/slab: remove BAD_ALIEN_MAGIC again
Initial attemp to remove BAD_ALIEN_MAGIC is once reverted by 'commit edcad2509550 ("Revert "slab: remove BAD_ALIEN_MAGIC"")' because it causes a problem on m68k which has many node but !CONFIG_NUMA. In this case, although alien cache isn't used at all but to cope with some initialization path, garbage value is used and that is BAD_ALIEN_MAGIC. Now, this patch set use_alien_caches to 0 when !CONFIG_NUMA, there is no initialization path problem so we don't need BAD_ALIEN_MAGIC at all. So remove it. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Christoph Lameter <cl@linux.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 3f1cc1ca4d88..f36d3493f49f 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -421,8 +421,6 @@ static struct kmem_cache kmem_cache_boot = {
.name = "kmem_cache",
};
-#define BAD_ALIEN_MAGIC 0x01020304ul
-
static DEFINE_PER_CPU(struct delayed_work, slab_reap_work);
static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
@@ -644,7 +642,7 @@ static int transfer_objects(struct array_cache *to,
static inline struct alien_cache **alloc_alien_cache(int node,
int limit, gfp_t gfp)
{
- return (struct alien_cache **)BAD_ALIEN_MAGIC;
+ return NULL;
}
static inline void free_alien_cache(struct alien_cache **ac_ptr)
@@ -1212,7 +1210,7 @@ void __init kmem_cache_init(void)
sizeof(struct rcu_head));
kmem_cache = &kmem_cache_boot;
- if (num_possible_nodes() == 1)
+ if (!IS_ENABLED(CONFIG_NUMA) || num_possible_nodes() == 1)
use_alien_caches = 0;
for (i = 0; i < NUM_INIT_LISTS; i++)