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

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Message-ID: <Z2b0p8XiBsa5VM27@e129823.arm.com>
Date: Sat, 21 Dec 2024 17:02:31 +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 11:39, Yeoreum Yun wrote:
> > 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.
>
> Ok, which I think is a problem, since the sysfs mode could overwrite the
> "config" while perf is preparing the config from the event parsing.
> And we would need it there. So, for the time being, we can accept this
> series, pending other review comments and address this issue separately
>

Here is the patchset fixing above one:
    - https://lore.kernel.org/linux-arm-kernel/20241221165934.1161856-1-yeoreum.yun@arm.com/