mm/list_lru: introduce list_lru_shrink_walk_irq()
authorSebastian Andrzej Siewior <bigeasy@linutronix.de>
Fri, 17 Aug 2018 22:49:55 +0000 (15:49 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 17 Aug 2018 23:20:32 +0000 (16:20 -0700)
commit6b51e88199ca4f75ff647eff28efd30bfcb08dc4
tree6c1411444d28a3a77c36bfddb92576b43469245f
parent6e018968f8d384d84484eba8e4c90489a25d7095
mm/list_lru: introduce list_lru_shrink_walk_irq()

Provide list_lru_shrink_walk_irq() and let it behave like
list_lru_walk_one() except that it locks the spinlock with
spin_lock_irq().  This is used by scan_shadow_nodes() because its lock
nests within the i_pages lock which is acquired with IRQ.  This change
allows to use proper locking promitives instead hand crafted
lock_irq_disable() plus spin_lock().

There is no EXPORT_SYMBOL provided because the current user is in-kernel
only.

Add list_lru_shrink_walk_irq() which acquires the spinlock with the
proper locking primitives.

Link: http://lkml.kernel.org/r/20180716111921.5365-5-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/list_lru.h
mm/list_lru.c
mm/workingset.c