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authorHugh Dickins <hughd@google.com>2015-11-05 18:49:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-05 19:34:48 -0800
commit2def7424c9be0069831380823fdb5cf72103b919 (patch)
treef1d3f11cc8e1fd3c30d281f4fc47301a4174db66 /mm/mremap.c
parent14e0f9bcc95f1aef26a9f860cceda35faee79b34 (diff)
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mm: page migration use the put_new_page whenever necessary
I don't know of any problem from the way it's used in our current tree, but there is one defect in page migration's custom put_new_page feature. An unused newpage is expected to be released with the put_new_page(), but there was one MIGRATEPAGE_SUCCESS (0) path which released it with putback_lru_page(): which can be very wrong for a custom pool. Fixed more easily by resetting put_new_page once it won't be needed, than by adding a further flag to modify the rc test. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Rik van Riel <riel@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
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