On 02/11/2016 05:04 AM, js1304@xxxxxxxxx wrote:
> 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>
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> 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;
> }
>
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