coresight-cti: change cti_drvdata spinlock's type to raw_spinlock_t

Browse source

In coresight-cti drivers, cti_drvdata->spinlock can be held during __schedule()
by perf_event_task_sched_out()/in().

Since cti_drvdata->spinlock type is spinlock_t and
perf_event_task_sched_out()/in() is called after acquiring rq_lock,
which is raw_spinlock_t (an unsleepable lock),
this poses an issue in PREEMPT_RT kernel where spinlock_t is sleepable.

To address this, change type cti_drvdata->spinlock in coresight-cti drivers,
which can be called by perf_event_task_sched_out()/in(),
from spinlock_t to raw_spinlock_t.

Reviewed-by: James Clark <james.clark@linaro.org>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250306121110.1647948-5-yeoreum.yun@arm.com

...

This commit is contained in:

Yeoreum Yun 2025-03-06 12:11:05 +00:00 • committed by Suzuki K Poulose

parent 4cf364ca57

commit e3044065fc

3 changed files with 61 additions and 61 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

44

drivers/hwtracing/coresight/coresight-cti-core.c

View file

76

drivers/hwtracing/coresight/coresight-cti-sysfs.c

View file

2

drivers/hwtracing/coresight/coresight-cti.h

View file