linux-kernel - Re: [PATCH v5 07/13] coresight: Don't reject unrecognized ETMv3 format attributes

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Message-ID: <CAJ9a7VjafO3NmEXH283wNzGpws3dweiUSW_vPjTA3TVb4ezL1g@mail.gmail.com>
Date: Thu, 20 Nov 2025 14:48:58 +0000
From: Mike Leach <mike.leach@...aro.org>
To: James Clark <james.clark@...aro.org>
Cc: Suzuki K Poulose <suzuki.poulose@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jonathan Corbet <corbet@....net>, 
	Leo Yan <leo.yan@....com>, Randy Dunlap <rdunlap@...radead.org>, coresight@...ts.linaro.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org
Subject: Re: [PATCH v5 07/13] coresight: Don't reject unrecognized ETMv3
 format attributes

On Tue, 18 Nov 2025 at 16:28, James Clark <james.clark@...aro.org> wrote:
>
> config isn't the only field, there are also config1, config2, etc.
> Rejecting unrecognized attributes is therefore inconsistent as it wasn't
> done for all fields. It was only necessary when we were directly
> programming attr->config into ETMCR and didn't hide the unsupported
> fields, but now it's not needed so remove it.
>
> Reviewed-by: Leo Yan <leo.yan@....com>
> Signed-off-by: James Clark <james.clark@...aro.org>
> ---
>  drivers/hwtracing/coresight/coresight-etm3x-core.c | 7 -------
>  1 file changed, 7 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> index 4511fc2f8d72..584d653eda81 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> @@ -333,13 +333,6 @@ static int etm_parse_event_config(struct etm_drvdata *drvdata,
>         if (config->mode)
>                 etm_config_trace_mode(config);
>
> -       /*
> -        * At this time only cycle accurate, return stack  and timestamp
> -        * options are available.
> -        */
> -       if (attr->config & ~ETM3X_SUPPORTED_OPTIONS)
> -               return -EINVAL;
> -
>         config->ctrl = 0;
>
>         if (ATTR_CFG_GET_FLD(attr, cycacc))
>
> --
> 2.34.1
>

Reviewed-by: Mike Leach <mike.leach@...aro.org>
-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK