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authorThomas Gleixner <tglx@linutronix.de>2017-07-11 01:50:06 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-11 02:32:33 +0300
commita47fed5b5b014f5a13878b90ef2c3a7dc294189f (patch)
tree5b1585724f028ec27c7ec701c30105feecbe5735 /mm/page_alloc.c
parent24c79d8e0a46bbd010ca9e0dc988a23981bcd423 (diff)
downloadlinux-a47fed5b5b014f5a13878b90ef2c3a7dc294189f.tar.xz
mm: swap: provide lru_add_drain_all_cpuslocked()
The rework of the cpu hotplug locking unearthed potential deadlocks with the memory hotplug locking code. The solution for these is to rework the memory hotplug locking code as well and take the cpu hotplug lock before the memory hotplug lock in mem_hotplug_begin(), but this will cause a recursive locking of the cpu hotplug lock when the memory hotplug code calls lru_add_drain_all(). Split out the inner workings of lru_add_drain_all() into lru_add_drain_all_cpuslocked() so this function can be invoked from the memory hotplug code with the cpu hotplug lock held. Link: http://lkml.kernel.org/r/20170704093421.419329357@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reported-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
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