blk_mq: call preempt_disable/enable in blk_mq_run_hw_queue, and only if needed

preempt_disable/enable surrounds every call to blk_mq_run_hw_queue,
except the one in blk-flush.c.  In fact that one is always asynchronous,
and it does not need smp_processor_id().

We can do the same for all other calls, avoiding preempt_disable when
async is true.  This avoids peppering blk-mq.c with preemption-disabled
regions.

Cc: Jens Axboe <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Reported-by: Clark Williams <[email protected]>
Tested-by: Clark Williams <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

0 files changed, 0 insertions, 0 deletions