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| author | Paolo Bonzini <pbonzini@redhat.com> | 2014-11-07 23:03:59 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-11-11 19:04:47 +0100 |
| commit | 398205b8391b208f0034a392242867b28ad8af3d (patch) | |
| tree | 2b7ce3ddc4029a15f7efbe4bb1e5711b9607dfc3 /kernel/utsname_sysctl.c | |
| parent | writeback: fix a subtle race condition in I_DIRTY clearing (diff) | |
| download | linux-398205b8391b208f0034a392242867b28ad8af3d.tar.xz linux-398205b8391b208f0034a392242867b28ad8af3d.zip | |
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 <axboe@kernel.dk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Clark Williams <williams@redhat.com>
Tested-by: Clark Williams <williams@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'kernel/utsname_sysctl.c')
0 files changed, 0 insertions, 0 deletions