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| author | Konstantin Khlebnikov <k.khlebnikov@samsung.com> | 2014-10-29 14:51:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-29 16:33:15 -0700 |
| commit | 4d88e6f7d5ffc84e6094a47925870f4a130555c2 (patch) | |
| tree | 8978c913f0c9f903efa665520ffe203d9013ff15 | |
| parent | 5417421b270229bfce0795ccc99a4b481e4954ca (diff) | |
| download | linux-4d88e6f7d5ffc84e6094a47925870f4a130555c2.tar.bz2 | |
mm/balloon_compaction: fix deflation when compaction is disabled
If CONFIG_BALLOON_COMPACTION=n balloon_page_insert() does not link pages
with balloon and doesn't set PagePrivate flag, as a result
balloon_page_dequeue() cannot get any pages because it thinks that all
of them are isolated. Without balloon compaction nobody can isolate
ballooned pages. It's safe to remove this check.
Fixes: d6d86c0a7f8d ("mm/balloon_compaction: redesign ballooned pages management").
Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
Reported-by: Matt Mullins <mmullins@mmlx.us>
Cc: <stable@vger.kernel.org> [3.17]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/balloon_compaction.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c index b3cbe19f71b5..fcad8322ef36 100644 --- a/mm/balloon_compaction.c +++ b/mm/balloon_compaction.c @@ -68,11 +68,13 @@ struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info) * to be released by the balloon driver. */ if (trylock_page(page)) { +#ifdef CONFIG_BALLOON_COMPACTION if (!PagePrivate(page)) { /* raced with isolation */ unlock_page(page); continue; } +#endif spin_lock_irqsave(&b_dev_info->pages_lock, flags); balloon_page_delete(page); __count_vm_event(BALLOON_DEFLATE); |