From: Anna-Maria Gleixner Date: Wed, 4 Apr 2018 11:43:56 +0200 Subject: [PATCH] bdi: Use irqsave variant of refcount_dec_and_lock() Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.18/older/patches-4.18.7-rt5.tar.xz 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. Signed-off-by: Anna-Maria Gleixner [bigeasy: s@atomic_dec_and_lock@refcount_dec_and_lock@g ] Signed-off-by: Sebastian Andrzej Siewior --- mm/backing-dev.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -473,11 +473,8 @@ void wb_congested_put(struct bdi_writeba { 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) {