From 6ca43ed8376a51afec790dd484a51804ade4352a Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 4 Oct 2019 10:17:37 -0400 Subject: dm clone: replace spin_lock_irqsave with spin_lock_irq If we are in a place where it is known that interrupts are enabled, functions spin_lock_irq/spin_unlock_irq should be used instead of spin_lock_irqsave/spin_unlock_irqrestore. spin_lock_irq and spin_unlock_irq are faster because they don't need to push and pop the flags register. Signed-off-by: Mikulas Patocka Signed-off-by: Nikos Tsironis Signed-off-by: Mike Snitzer --- drivers/md/dm-clone-metadata.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/md/dm-clone-metadata.h') diff --git a/drivers/md/dm-clone-metadata.h b/drivers/md/dm-clone-metadata.h index 434bff08508b..3fe50a781c11 100644 --- a/drivers/md/dm-clone-metadata.h +++ b/drivers/md/dm-clone-metadata.h @@ -44,7 +44,9 @@ int dm_clone_set_region_hydrated(struct dm_clone_metadata *cmd, unsigned long re * @start: Starting region number * @nr_regions: Number of regions in the range * - * This function doesn't block, so it's safe to call it from interrupt context. + * This function doesn't block, but since it uses spin_lock_irq()/spin_unlock_irq() + * it's NOT safe to call it from any context where interrupts are disabled, e.g., + * from interrupt context. */ int dm_clone_cond_set_range(struct dm_clone_metadata *cmd, unsigned long start, unsigned long nr_regions); -- cgit