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bdi: use irqsave variant of refcount_dec_and_lock()

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The irqsave variant of refcount_dec_and_lock handles irqsave/restore when
taking/releasing the spin lock.  With this variant the call of
local_irq_save/restore is no longer required.

[[email protected]: s@atomic_dec_and_lock@refcount_dec_and_lock@g]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Anna-Maria Gleixner <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Anna-Maria Gleixner 2018-08-21 21:55:35 -07:00 • committed by Linus Torvalds
commit 060288a732
1 changed files with 1 additions and 4 deletions
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5
mm/backing-dev.c
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@ -473,11 +473,8 @@ void wb_congested_put(struct bdi_writeback_congested *congested)
{
unsigned long flags;
local_irq_save(flags);
if (!refcount_dec_and_lock(&congested->refcnt, &cgwb_lock)) {
local_irq_restore(flags);
if (!refcount_dec_and_lock_irqsave(&congested->refcnt, &cgwb_lock, &flags))
return;
}
/* bdi might already have been destroyed leaving @congested unlinked */
if (congested->__bdi) {