summaryrefslogtreecommitdiffstats
path: root/block/Kconfig
diff options
context:
space:
mode:
authorAndrea Arcangeli <aarcange@redhat.com>2012-09-28 14:35:31 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-09-28 08:38:09 -0700
commit99a1300e1d84709f419182bb5189760e78234882 (patch)
tree1d3cc49d4015fbb2b3d5bbeed313d30d7756526b /block/Kconfig
parent63994137eb53bb0fc42ad180c0ce509d3eb3bdc9 (diff)
downloadop-kernel-dev-99a1300e1d84709f419182bb5189760e78234882.zip
op-kernel-dev-99a1300e1d84709f419182bb5189760e78234882.tar.gz
thp: avoid VM_BUG_ON page_count(page) false positives in __collapse_huge_page_copy
Speculative cache pagecache lookups can elevate the refcount from under us, so avoid the false positive. If the refcount is < 2 we'll be notified by a VM_BUG_ON in put_page_testzero as there are two put_page(src_page) in a row before returning from this function. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Petr Holasek <pholasek@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'block/Kconfig')
0 files changed, 0 insertions, 0 deletions
OpenPOWER on IntegriCloud