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>
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