1 files changed, 60 insertions, 0 deletions

diff --git a/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.17/0022-mm-fix-s390-BUG-by-__set_page_dirty_no_writeback-on-.patch b/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.17/0022-mm-fix-s390-BUG-by-__set_page_dirty_no_writeback-on-.patch
new file mode 100644
index 00000000..4ba10abc
--- /dev/null
+++ b/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.17/0022-mm-fix-s390-BUG-by-__set_page_dirty_no_writeback-on-.patch
@@ -0,0 +1,60 @@
+From 8afb43e5f076643f012d0267aebb215cc0f0767b Mon Sep 17 00:00:00 2001
+From: Hugh Dickins <hughd@google.com>
+Date: Mon, 23 Apr 2012 11:14:50 -0700
+Subject: [PATCH 022/165] mm: fix s390 BUG by __set_page_dirty_no_writeback on
+ swap
+
+commit aca50bd3b4c4bb5528a1878158ba7abce41de534 upstream.
+
+Mel reports a BUG_ON(slot == NULL) in radix_tree_tag_set() on s390
+3.0.13: called from __set_page_dirty_nobuffers() when page_remove_rmap()
+tries to transfer dirty flag from s390 storage key to struct page and
+radix_tree.
+
+That would be because of reclaim's shrink_page_list() calling
+add_to_swap() on this page at the same time: first PageSwapCache is set
+(causing page_mapping(page) to appear as &swapper_space), then
+page->private set, then tree_lock taken, then page inserted into
+radix_tree - so there's an interval before taking the lock when the
+radix_tree slot is empty.
+
+We could fix this by moving __add_to_swap_cache()'s spin_lock_irq up
+before the SetPageSwapCache.  But a better fix is simply to do what's
+five years overdue: Ken Chen introduced __set_page_dirty_no_writeback()
+(if !PageDirty TestSetPageDirty) for tmpfs to skip all the radix_tree
+overhead, and swap is just the same - it ignores the radix_tree tag, and
+does not participate in dirty page accounting, so should be using
+__set_page_dirty_no_writeback() too.
+
+s390 testing now confirms that this does indeed fix the problem.
+
+Reported-by: Mel Gorman <mgorman@suse.de>
+Signed-off-by: Hugh Dickins <hughd@google.com>
+Acked-by: Mel Gorman <mgorman@suse.de>
+Cc: Andrew Morton <akpm@linux-foundation.org>
+Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
+Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
+Cc: Rik van Riel <riel@redhat.com>
+Cc: Ken Chen <kenchen@google.com>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+ mm/swap_state.c |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/mm/swap_state.c b/mm/swap_state.c
+index 78cc4d1..7704d9c 100644
+--- a/mm/swap_state.c
++++ b/mm/swap_state.c
+@@ -27,7 +27,7 @@
+  */
+ static const struct address_space_operations swap_aops = {
+        .writepage      = swap_writepage,
+-       .set_page_dirty = __set_page_dirty_nobuffers,
++       .set_page_dirty = __set_page_dirty_no_writeback,
+        .migratepage    = migrate_page,
+ };
+ 
+-- 
+1.7.7.6
+