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

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Date:   Sun, 13 Sep 2020 14:17:05 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     tingwei@...eaurora.org, mathieu.poirier@...aro.org,
        alexander.shishkin@...ux.intel.com, mike.leach@...aro.org
Cc:     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 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 ?

Suzuki