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Cyrill Gorcunov authored
Dave reported corrupted swap entries | [ 4588.541886] swap_free: Unused swap offset entry 00002d15 | [ 4588.541952] BUG: Bad page map in process trinity-kid12 pte:005a2a80 pmd:22c01f067 and Hugh pointed that in move_ptes _PAGE_SOFT_DIRTY bit set regardless the type of entry pte consists of. The trick here is that when we carry soft dirty status in swap entries we are to use _PAGE_SWP_SOFT_DIRTY instead, because this is the only place in pte which can be used for own needs without intersecting with bits owned by swap entry type/offset. Reported-and-tested-by:
Dave Jones <davej@redhat.com> Signed-off-by:
Cyrill Gorcunov <gorcunov@openvz.org> Cc: Pavel Emelyanov <xemul@parallels.com> Analyzed-by:
Hugh Dickins <hughd@google.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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