| From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| Date: Tue, 14 Jul 2015 14:26:34 +0200 |
| Subject: block/mq: do not invoke preempt_disable() |
| |
| preempt_disable() and get_cpu() don't play well together with the sleeping |
| locks it tries to allocate later. |
| It seems to be enough to replace it with get_cpu_light() and migrate_disable(). |
| |
| Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| --- |
| block/blk-mq.c | 6 +++--- |
| 1 file changed, 3 insertions(+), 3 deletions(-) |
| |
| --- a/block/blk-mq.c |
| +++ b/block/blk-mq.c |
| @@ -1571,14 +1571,14 @@ static void __blk_mq_delay_run_hw_queue( |
| return; |
| |
| if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { |
| - int cpu = get_cpu(); |
| + int cpu = get_cpu_light(); |
| if (cpumask_test_cpu(cpu, hctx->cpumask)) { |
| __blk_mq_run_hw_queue(hctx); |
| - put_cpu(); |
| + put_cpu_light(); |
| return; |
| } |
| |
| - put_cpu(); |
| + put_cpu_light(); |
| } |
| |
| kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work, |
