linux-kernel - Re: [PATCH v10 09/24] coresight: etm3x: allow etm3x to be built as a module

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Date:   Mon, 14 Sep 2020 12:11:40 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     tingwei@...eaurora.org, alexander.shishkin@...ux.intel.com,
        mike.leach@...aro.org, kim.phillips@....com,
        gregkh@...uxfoundation.org, leo.yan@...aro.org,
        rdunlap@...radead.org, linux@...linux.org.uk, ykaukab@...e.de,
        tsoni@...eaurora.org, saiprakash.ranjan@...eaurora.org,
        jinlmao@...eaurora.org, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 09/24] coresight: etm3x: allow etm3x to be built as a
 module

On Sun, Sep 13, 2020 at 02:17:05PM +0100, Suzuki K Poulose wrote:
> On 08/21/2020 04:44 AM, Tingwei Zhang wrote:
> > From: Kim Phillips <kim.phillips@....com>
> > 
> > Allow to build coresight-etm3x as a module, for ease of development.
> > 
> > - Kconfig becomes a tristate, to allow =m
> > - append -core to source file name to allow module to
> >    be called coresight-etm3x by the Makefile
> > - add an etm_remove function, for module unload
> > - add a MODULE_DEVICE_TABLE for autoloading on boot
> > 
> > Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> > Cc: Leo Yan <leo.yan@...aro.org>
> > Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> > Cc: Randy Dunlap <rdunlap@...radead.org>
> > Cc: Suzuki K Poulose <Suzuki.Poulose@....com>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: Russell King <linux@...linux.org.uk>
> > Signed-off-by: Kim Phillips <kim.phillips@....com>
> > Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org>
> > Reviewed-by: Mike Leach <mike.leach@...aro.org>
> 
> 
> > diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> > similarity index 97%
> > rename from drivers/hwtracing/coresight/coresight-etm3x.c
> > rename to drivers/hwtracing/coresight/coresight-etm3x-core.c
> > index bf22dcfd3327..ba9c86497acb 100644
> > --- a/drivers/hwtracing/coresight/coresight-etm3x.c
> > +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> > @@ -895,6 +895,23 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> >   	return ret;
> >   }
> > +static int __exit etm_remove(struct amba_device *adev)
> > +{
> > +	struct etm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
> > +
> > +	etm_perf_symlink(drvdata->csdev, false);
> > +
> > +	if (--etm_count == 0) {
> > +		cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
> > +		if (hp_online)
> > +			cpuhp_remove_state_nocalls(hp_online);
> > +	}
> > +
> > +	coresight_unregister(drvdata->csdev);
> > +
> > +	return 0;
> > +}
> > +
> 
> Don't we need to fix the races like we did for ETMv4 ?

This is one of the things I wanted to get back to but Suzuki beat me to it.

I am now done reviewing this set.

Thanks,
Mathieu

> 
> Suzuki