linux-kernel - Re: [PATCH v4 0/9] coresight: change some driver' spinlock type to raw_spinlock

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Message-ID: <6c00cf65-af68-49fb-b762-675186f45abe@arm.com>
Date: Tue, 25 Feb 2025 10:23:11 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Yeoreum Yun <yeoreum.yun@....com>, james.clark@...aro.org,
 alexander.shishkin@...ux.intel.com, bigeasy@...utronix.de,
 clrkwllms@...nel.org, rostedt@...dmis.org, mike.leach@...aro.org
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH v4 0/9] coresight: change some driver' spinlock type to
 raw_spinlock_t

Hi Levi,

On 20/12/2024 10:45, Yeoreum Yun wrote:
> In some coresight drivers, drvdata->spinlock can be held during __schedule()
> by perf_event_task_sched_out()/in().
> 
> Since 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 drvdata->spinlock in some coresight 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@...aro.org>

This doesn't apply cleanly on coresight next branch. Please could you 
rebase on coresight /next ?

Cheers
Suzuki


> 
> Yeoreum Yun (9):
>    coresight: change coresight_device lock type to  raw_spinlock_t
>    coresight-etm4x: change etmv4_drvdata spinlock type to  raw_spinlock_t
>    coresight: change coresight_trace_id_map's lock type to
>      raw_spinlock_t
>    coresight-cti: change cti_drvdata spinlock's type to raw_spinlock_t
>    coresight-etb10: change etb_drvdata spinlock's type to raw_spinlock_t
>    coresight-funnel: change funnel_drvdata spinlock's type to
>      raw_spinlock_t
>    coresight-replicator: change replicator_drvdata spinlock's type to
>      raw_spinlock_t
>    coresight-tmc: change tmc_drvdata spinlock's type to raw_spinlock_t
>    coresight/ultrasoc: change smb_drv_data spinlock's type to
>      raw_spinlock_t
> 
>   .../hwtracing/coresight/coresight-config.c    |   8 +-
>   .../hwtracing/coresight/coresight-config.h    |   2 +-
>   drivers/hwtracing/coresight/coresight-core.c  |   2 +-
>   .../hwtracing/coresight/coresight-cti-core.c  |  44 +--
>   .../hwtracing/coresight/coresight-cti-sysfs.c |  76 +++---
>   drivers/hwtracing/coresight/coresight-cti.h   |   2 +-
>   drivers/hwtracing/coresight/coresight-etb10.c |  26 +-
>   .../coresight/coresight-etm4x-core.c          |  18 +-
>   .../coresight/coresight-etm4x-sysfs.c         | 250 +++++++++---------
>   drivers/hwtracing/coresight/coresight-etm4x.h |   2 +-
>   .../hwtracing/coresight/coresight-funnel.c    |  12 +-
>   .../coresight/coresight-replicator.c          |  12 +-
>   .../hwtracing/coresight/coresight-syscfg.c    |  26 +-
>   .../hwtracing/coresight/coresight-tmc-core.c  |   6 +-
>   .../hwtracing/coresight/coresight-tmc-etf.c   |  48 ++--
>   .../hwtracing/coresight/coresight-tmc-etr.c   |  40 +--
>   drivers/hwtracing/coresight/coresight-tmc.h   |   2 +-
>   .../hwtracing/coresight/coresight-trace-id.c  |  22 +-
>   drivers/hwtracing/coresight/ultrasoc-smb.c    |  12 +-
>   drivers/hwtracing/coresight/ultrasoc-smb.h    |   2 +-
>   include/linux/coresight.h                     |   4 +-
>   21 files changed, 308 insertions(+), 308 deletions(-)
> 
> --
> LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}