From: Vitaly Wool <vitalywool@gmail.com>
To: Linux-MM <linux-mm@kvack.org>, linux-kernel@vger.kernel.org
Cc: Seth Jennings <sjenning@redhat.com>,
Dan Streetman <ddstreet@ieee.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH] z3fold: avoid modifying HEADLESS page and minor cleanup
Date: Fri, 27 May 2016 18:06:07 +0200
Message-ID: <5748706F.9020208@gmail.com> (raw)
This patch fixes erroneous z3fold header access in a HEADLESS page
in reclaim function, and changes one remaining direct
handle-to-buddy conversion to use the appropriate helper.
Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
---
mm/z3fold.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/mm/z3fold.c b/mm/z3fold.c
index 34917d5..8f9e89c 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -412,7 +412,7 @@ static void z3fold_free(struct z3fold_pool *pool, unsigned long handle)
/* HEADLESS page stored */
bud = HEADLESS;
} else {
- bud = (handle - zhdr->first_num) & BUDDY_MASK;
+ bud = handle_to_buddy(handle);
switch (bud) {
case FIRST:
@@ -572,15 +572,19 @@ next:
pool->pages_nr--;
spin_unlock(&pool->lock);
return 0;
- } else if (zhdr->first_chunks != 0 &&
- zhdr->last_chunks != 0 && zhdr->middle_chunks != 0) {
- /* Full, add to buddied list */
- list_add(&zhdr->buddy, &pool->buddied);
- } else if (!test_bit(PAGE_HEADLESS, &page->private)) {
- z3fold_compact_page(zhdr);
- /* add to unbuddied list */
- freechunks = num_free_chunks(zhdr);
- list_add(&zhdr->buddy, &pool->unbuddied[freechunks]);
+ } else if (!test_bit(PAGE_HEADLESS, &page->private)) {
+ if (zhdr->first_chunks != 0 &&
+ zhdr->last_chunks != 0 &&
+ zhdr->middle_chunks != 0) {
+ /* Full, add to buddied list */
+ list_add(&zhdr->buddy, &pool->buddied);
+ } else {
+ z3fold_compact_page(zhdr);
+ /* add to unbuddied list */
+ freechunks = num_free_chunks(zhdr);
+ list_add(&zhdr->buddy,
+ &pool->unbuddied[freechunks]);
+ }
}
/* add to beginning of LRU */
--
2.5.0
--
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Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-27 16:06 Vitaly Wool [this message]
2016-05-27 18:37 ` Dan Streetman
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