This is a note to let you know that I've just added the patch titled
mm/balloon_compaction: fix deflation when compaction is disabled
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-balloon_compaction-fix-deflation-when-compaction-is-disabled.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4d88e6f7d5ffc84e6094a47925870f4a130555c2 Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx>
Date: Wed, 29 Oct 2014 14:51:02 -0700
Subject: mm/balloon_compaction: fix deflation when compaction is disabled
From: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx>
commit 4d88e6f7d5ffc84e6094a47925870f4a130555c2 upstream.
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@xxxxxxxxxxx>
Reported-by: Matt Mullins <mmullins@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/balloon_compaction.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -93,11 +93,13 @@ struct page *balloon_page_dequeue(struct
* 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);
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
Patches currently in stable-queue which might be from k.khlebnikov@xxxxxxxxxxx are
queue-3.17/mm-balloon_compaction-fix-deflation-when-compaction-is-disabled.patch
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