linux-kernel - Re: [PATCH v2 1/3] coresight: tmc: Add missing doc of tmc

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Message-ID: <41ddbd02-f2a5-f287-5096-90a420aee441@huawei.com>
Date: Sat, 19 Jul 2025 19:05:30 +0800
From: hejunhao <hejunhao3@...wei.com>
To: Leo Yan <leo.yan@....com>
CC: <anshuman.khandual@....com>, <coresight@...ts.linaro.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...wei.com>, <jonathan.cameron@...wei.com>,
	<yangyicong@...wei.com>, <prime.zeng@...ilicon.com>
Subject: Re: [PATCH v2 1/3] coresight: tmc: Add missing doc of
 tmc_drvdata::reading


On 2025/7/2 23:27, Leo Yan wrote:
> On Fri, Jun 20, 2025 at 03:54:10PM +0800, Junhao He wrote:
>> From: Yicong Yang <yangyicong@...ilicon.com>
>>
>> tmc_drvdata::reading is used to indicate whether a reading process
>> is performed through /dev/xyz.tmc. Document it.
>>
>> Reviewed-by: James Clark <james.clark@...aro.org>
>> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
>> Signed-off-by: Junhao He <hejunhao3@...wei.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-tmc.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
>> index 6541a27a018e..3ca0d40c580d 100644
>> --- a/drivers/hwtracing/coresight/coresight-tmc.h
>> +++ b/drivers/hwtracing/coresight/coresight-tmc.h
>> @@ -220,6 +220,7 @@ struct tmc_resrv_buf {
>>    * @pid:	Process ID of the process that owns the session that is using
>>    *		this component. For example this would be the pid of the Perf
>>    *		process.
>> + * @reading:	buffer's in the reading through "/dev/xyz.tmc" entry
> Are you working on the latest code base? For example, the mainline
> kernel or coresight next branch.
> The latest code already has comment for reading, and I saw a duplicated
> "reading" field in tmc_drvdata.

This patch is based on mainline kernel v6.16-rc1, and adds a comment to 
struct tmc_drvdata::reading.
Perhaps, this git log could easily be misunderstood as adding comments 
to tmc_resrv_buf::reading.

> The tmc_resrv_buf structure does not have the fields "pid",
> "stop_on_flush", "buf", etc. They have been moved into the tmc_drvdata
> structure.
>
> Thanks,
> Leo
>
>>    * @stop_on_flush: Stop on flush trigger user configuration.
>>    * @buf:	Snapshot of the trace data for ETF/ETB.
>>    * @etr_buf:	details of buffer used in TMC-ETR
>> -- 
>> 2.33.0
>>
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