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| author | Wander Lairson Costa <wander@redhat.com> | 2021-12-20 22:28:27 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-12-20 23:50:14 +0300 |
| commit | 361c81dbc58c8aa230e1f2d556045fa7bc3eb4a3 (patch) | |
| tree | ce8ee18c100f6ddaedfb01f8da170c7d958dd591 /block | |
| parent | 5ef1630586317e92c9ebd7b4ce48f393b7ff790f (diff) | |
| download | linux-361c81dbc58c8aa230e1f2d556045fa7bc3eb4a3.tar.xz | |
blktrace: switch trace spinlock to a raw spinlock
The running_trace_lock protects running_trace_list and is acquired
within the tracepoint which implies disabled preemption. The spinlock_t
typed lock can not be acquired with disabled preemption on PREEMPT_RT
because it becomes a sleeping lock.
The runtime of the tracepoint depends on the number of entries in
running_trace_list and has no limit. The blk-tracer is considered debug
code and higher latencies here are okay.
Make running_trace_lock a raw_spinlock_t.
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20211220192827.38297-1-wander@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions