The patch titled
slub-do-our-own-locking-via-slab_lock-and-slab_unlock-checkpatch-fixes
has been added to the -mm tree. Its filename is
slub-do-our-own-locking-via-slab_lock-and-slab_unlock-checkpatch-fixes.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: slub-do-our-own-locking-via-slab_lock-and-slab_unlock-checkpatch-fixes
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
ERROR: do not use assignment in if condition
#627: FILE: mm/slub.c:2827:
+ if (!page->inuse && (state = slab_trylock(page))) {
total: 1 errors, 0 warnings, 611 lines checked
Your patch has style problems, please review. If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
Please run checkpatch prior to sending patches
Seems nicer this way.
Should the `if (page->inuse)' test be marked unlikely()?
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 25 ++++++++++++++-----------
1 file changed, 14 insertions(+), 11 deletions(-)
diff -puN mm/slub.c~slub-do-our-own-locking-via-slab_lock-and-slab_unlock-checkpatch-fixes mm/slub.c
--- a/mm/slub.c~slub-do-our-own-locking-via-slab_lock-and-slab_unlock-checkpatch-fixes
+++ a/mm/slub.c
@@ -2807,20 +2807,23 @@ int kmem_cache_shrink(struct kmem_cache
* list_lock. page->inuse here is the upper limit.
*/
list_for_each_entry_safe(page, t, &n->partial, lru) {
- if (!page->inuse && (state = slab_trylock(page))) {
- /*
- * Must hold slab lock here because slab_free
- * may have freed the last object and be
- * waiting to release the slab.
- */
- list_del(&page->lru);
- n->nr_partial--;
- slab_unlock(page, state);
- discard_slab(s, page);
- } else {
+ if (page->inuse) {
list_move(&page->lru,
slabs_by_inuse + page->inuse);
+ continue;
}
+ state = slab_trylock(page);
+ if (!state)
+ continue;
+ /*
+ * Must hold slab lock here because slab_free may have
+ * freed the last object and be waiting to release the
+ * slab.
+ */
+ list_del(&page->lru);
+ n->nr_partial--;
+ slab_unlock(page, state);
+ discard_slab(s, page);
}
/*
_
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