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    Subject[PATCH 2/5] mm/slub: query dynamic DEBUG_PAGEALLOC setting
    Date
    We can disable debug_pagealloc processing even if the code is complied
    with CONFIG_DEBUG_PAGEALLOC. This patch changes the code to query
    whether it is enabled or not in runtime.

    Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    ---
    mm/slub.c | 11 ++++++-----
    1 file changed, 6 insertions(+), 5 deletions(-)

    diff --git a/mm/slub.c b/mm/slub.c
    index 7d4da68..7b5a965 100644
    --- a/mm/slub.c
    +++ b/mm/slub.c
    @@ -256,11 +256,12 @@ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
    {
    void *p;

    -#ifdef CONFIG_DEBUG_PAGEALLOC
    - probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p));
    -#else
    - p = get_freepointer(s, object);
    -#endif
    + if (debug_pagealloc_enabled()) {
    + probe_kernel_read(&p,
    + (void **)(object + s->offset), sizeof(p));
    + } else
    + p = get_freepointer(s, object);
    +
    return p;
    }

    --
    1.9.1
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