diff options
| author | Vitaly Wool <vitalywool@gmail.com> | 2016-06-03 23:55:47 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-06-04 01:02:55 +0200 |
| commit | 43afc19417ca92cf237095947f597f21d86fd2a7 (patch) | |
| tree | a9976414d5dab53237a8b283aa5030b16a44adcb /mm | |
| parent | memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_... (diff) | |
| download | linux-43afc19417ca92cf237095947f597f21d86fd2a7.tar.xz linux-43afc19417ca92cf237095947f597f21d86fd2a7.zip | |
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
Fix erroneous z3fold header access in a HEADLESS page in reclaim
function, and change one remaining direct handle-to-buddy conversion to
use the appropriate helper.
Link: http://lkml.kernel.org/r/5748706F.9020208@gmail.com
Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Reviewed-by: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjenning@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/z3fold.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/mm/z3fold.c b/mm/z3fold.c index 34917d55d311..8f9e89ca1d31 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 */ |