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Subject[PATCH 15/16] slab: remove useless statement for checking pfmemalloc
Date
Now, virt_to_page(page->s_mem) is same as the page,
because slab use this structure for management.
So remove useless statement.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

diff --git a/mm/slab.c b/mm/slab.c
index cf39309..6abc069 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -750,9 +750,7 @@ static struct array_cache *alloc_arraycache(int node, int entries,

static inline bool is_slab_pfmemalloc(struct page *page)
{
- struct page *mem_page = virt_to_page(page->s_mem);
-
- return PageSlabPfmemalloc(mem_page);
+ return PageSlabPfmemalloc(page);
}

/* Clears pfmemalloc_active if no slabs have pfmalloc set */
@@ -817,7 +815,7 @@ static void *__ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac,
n = cachep->node[numa_mem_id()];
if (!list_empty(&n->slabs_free) && force_refill) {
struct page *page = virt_to_head_page(objp);
- ClearPageSlabPfmemalloc(virt_to_head_page(page->s_mem));
+ ClearPageSlabPfmemalloc(page);
clear_obj_pfmemalloc(&objp);
recheck_pfmemalloc_active(cachep, ac);
return objp;
@@ -850,8 +848,7 @@ static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac,
if (unlikely(pfmemalloc_active)) {
/* Some pfmemalloc slabs exist, check if this is one */
struct page *page = virt_to_head_page(objp);
- struct page *mem_page = virt_to_head_page(page->s_mem);
- if (PageSlabPfmemalloc(mem_page))
+ if (PageSlabPfmemalloc(page))
set_obj_pfmemalloc(&objp);
}

--
1.7.9.5


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