slob: fix page order calculation on not 4KB page

SLOB doesn't calculate correct page order when page size is not 4KB.  This
patch fixes it with using get_order() instead of find_order() which is SLOB
version of get_order().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 12 deletions

diff --git a/mm/slob.c b/mm/slob.c
index c9401a7eaa5f..c6933bc19bcd 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -150,15 +150,6 @@ static void slob_free(void *block, int size)
         spin_unlock_irqrestore(&slob_lock, flags);
 }
 
-static int FASTCALL(find_order(int size));
-static int fastcall find_order(int size)
-{
-        int order = 0;
-        for ( ; size > 4096 ; size >>=1)
-                order++;
-        return order;
-}
-
 void *__kmalloc(size_t size, gfp_t gfp)
 {
         slob_t *m;
@@ -174,7 +165,7 @@ void *__kmalloc(size_t size, gfp_t gfp)
         if (!bb)
                 return 0;
 
-        bb->order = find_order(size);
+        bb->order = get_order(size);
         bb->pages = (void *)__get_free_pages(gfp, bb->order);
 
         if (bb->pages) {
@@ -318,7 +309,7 @@ void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags)
         if (c->size < PAGE_SIZE)
                 b = slob_alloc(c->size, flags, c->align);
         else
-                b = (void *)__get_free_pages(flags, find_order(c->size));
+                b = (void *)__get_free_pages(flags, get_order(c->size));
 
         if (c->ctor)
                 c->ctor(b, c, SLAB_CTOR_CONSTRUCTOR);
@@ -345,7 +336,7 @@ void kmem_cache_free(struct kmem_cache *c, void *b)
         if (c->size < PAGE_SIZE)
                 slob_free(b, c->size);
         else
-                free_pages((unsigned long)b, find_order(c->size));
+                free_pages((unsigned long)b, get_order(c->size));
 }
 EXPORT_SYMBOL(kmem_cache_free);