[PATCH 0/4] small fix for configuaring etm csdev via sysfs

Yeoreum Yun yeoreum.yun at arm.com
Fri May 2 03:53:44 PDT 2025


Gentle ping in case of forgotten.

> when etm csdev's configuration is modified via sysfs while etm is being
> enabled via perf, enabled etm could run with different configuration
> from perf_event.
>
> Also, there are some redeundant usage of drvdata->spinlock in
> etm_starting/dying_cpu() with enable/disable etm device.
>
> This patchset fixes above small problems.
>
> NOTE:
>    This patchset based on:
>      - https://lore.kernel.org/linux-arm-kernel/20241220104521.809071-1-yeoreum.yun@arm.com/
>
> Yeoreum Yun (4):
>   coresight/etm4x: disallow altering config via sysfs while enabled
>   coresight/etm4x: remove redundant usage of drvdata->spinlock
>   coresight/etm3x: disallow altering config via sysfs while enabled
>   coresight/etm3x: remove redundant usage of drvdata->spinlock
>
>  .../coresight/coresight-etm3x-core.c          |  33 ++---
>  .../coresight/coresight-etm3x-sysfs.c         | 120 ++++++++++++++++
>  .../coresight/coresight-etm4x-core.c          |  20 +--
>  .../coresight/coresight-etm4x-sysfs.c         | 132 +++++++++++++++++-
>  4 files changed, 272 insertions(+), 33 deletions(-)
>
> --
> LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
>

--
Sincerely,
Yeoreum Yun



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