The patch titled
Subject: mm/slub.c: clean up validate_slab()
has been added to the -mm tree. Its filename is
mm-clean-up-validate_slab.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-clean-up-validate_slab.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-clean-up-validate_slab.patch
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------------------------------------------------------
From: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: mm/slub.c: clean up validate_slab()
The function doesn't need to return any value, and the check can be done
in one pass.
There is a behavior change: before the patch, we stop at the first invalid
free object; after the patch, we stop at the first invalid object, free or
in use. This shouldn't matter because the original behavior isn't
intended anyway.
Link: http://lkml.kernel.org/r/20191108193958.205102-1-yuzhao@xxxxxxxxxx
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
--- a/mm/slub.c~mm-clean-up-validate_slab
+++ a/mm/slub.c
@@ -4384,31 +4384,26 @@ static int count_total(struct page *page
#endif
#ifdef CONFIG_SLUB_DEBUG
-static int validate_slab(struct kmem_cache *s, struct page *page,
+static void validate_slab(struct kmem_cache *s, struct page *page,
unsigned long *map)
{
void *p;
void *addr = page_address(page);
- if (!check_slab(s, page) ||
- !on_freelist(s, page, NULL))
- return 0;
+ if (!check_slab(s, page) || !on_freelist(s, page, NULL))
+ return;
/* Now we know that a valid freelist exists */
bitmap_zero(map, page->objects);
get_map(s, page, map);
for_each_object(p, s, addr, page->objects) {
- if (test_bit(slab_index(p, s, addr), map))
- if (!check_object(s, page, p, SLUB_RED_INACTIVE))
- return 0;
- }
+ u8 val = test_bit(slab_index(p, s, addr), map) ?
+ SLUB_RED_INACTIVE : SLUB_RED_ACTIVE;
- for_each_object(p, s, addr, page->objects)
- if (!test_bit(slab_index(p, s, addr), map))
- if (!check_object(s, page, p, SLUB_RED_ACTIVE))
- return 0;
- return 1;
+ if (!check_object(s, page, p, val))
+ break;
+ }
}
static void validate_slab_slab(struct kmem_cache *s, struct page *page,
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-update-comments-in-slubc.patch
mm-clean-up-validate_slab.patch
mm-avoid-slub-allocation-while-holding-list_lock.patch
