From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
We can disable debug_pagealloc processing even if the code is compiled
with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query
whether it is enabled or not in runtime.
v2: clean up code, per Christian.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
mm/slub.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 606488b..a1874c2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -250,11 +250,10 @@ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
{
void *p;
-#ifdef CONFIG_DEBUG_PAGEALLOC
+ if (!debug_pagealloc_enabled())
+ return get_freepointer(s, object);
+
probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p));
-#else
- p = get_freepointer(s, object);
-#endif
return p;
}
--
1.9.1
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