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H A Dvmscan.cdiff 1732d2b0117c26a6bf6027c919e49603156ea93d Tue Jul 16 18:26:15 CDT 2019 Andrew Morton <akpm@linux-foundation.org> mm/vmscan.c: add checks for incorrect handling of current->reclaim_state

Six sites are presently altering current->reclaim_state. There is a
risk that one function stomps on a caller's value. Use a helper
function to catch such errors.

Cc: Yafang Shao <laoar.shao@gmail.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>