linux-kernel - Re: [PATCH v3 0/9] coresight: change some driver' spinlock type to raw_spinlock

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Message-ID: <Z2VXc/R/nOLGz+Cg@e129823.arm.com>
Date: Fri, 20 Dec 2024 11:39:31 +0000
From: Yeoreum Yun <yeoreum.yun@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>
Cc: Mike Leach <mike.leach@...aro.org>, james.clark@...aro.org,
	alexander.shishkin@...ux.intel.com, bigeasy@...utronix.de,
	clrkwllms@...nel.org, rostedt@...dmis.org,
	coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH v3 0/9] coresight: change some driver' spinlock type to
 raw_spinlock_t

Hi Suzuki,
> On 20/12/2024 10:38, Yeoreum Yun wrote:
> > Hi Mike.
> >
> > > Notably missing is the same changes for the etm3x driver. The ETMv3.x
> > > and PTM1.x are supported by this driver, and these trace source
> > > variants are also supported in perf in the cs_etm.c code.
> >
> > But I wonder etmv3 needs to change. Because its spinlock is used only
> > via sysfs enable/disable path.
> > So, I think it doesn't need to change the lock type.
>
> ETM3 can be used in perf mode, similar to the ETM4x.
>
> So, you need to fix it as well.

Yes. But etmv3's etmdata->spinlock doesn't used in perf path
its usage is only in sysfs interface path.
That's why I think it could skip too.

Thanks.