linux-kernel - Re: [PATCH 0/3] perf tools: Enable strict JSON parsing

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Date:   Tue, 12 Oct 2021 14:30:51 +0100
From:   James Clark <james.clark@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        kajoljain <kjain@...ux.ibm.com>
Cc:     john.garry@...wei.com, ak@...ux.intel.com,
        linux-perf-users@...r.kernel.org, Nick.Forrington@....com,
        Andrew.Kilroy@....com, Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] perf tools: Enable strict JSON parsing



On 08/10/2021 20:00, Arnaldo Carvalho de Melo wrote:
> Em Fri, Oct 08, 2021 at 04:56:55PM +0530, kajoljain escreveu:
>>
>>
>> On 10/8/21 3:32 PM, James Clark wrote:
>>>
>>>
>>> On 08/10/2021 08:43, kajoljain wrote:
>>>>
>>>>
>>>> On 10/7/21 4:35 PM, James Clark wrote:
>>>>> After a discussion on "[PATCH 1/4] perf vendor events: Syntax corrections in Neoverse N1 json",
>>>>> John Garry suggested that we can just modify the parser to make it more strict. Hopefully this will
>>>>> remove the need to apply any future JSON comma fixup commits.
>>>>>
>>>>> Applies on top of "[PATCH v2 1/3] perf vendor events: Syntax corrections in Neoverse N1 json" on
>>>>> perf/core.
>>>>>
>>>>> Also available at:
>>>>>   git clone --branch james-json-parse-fix git@....gitlab.arm.com:linux-arm/linux-jc.git
>>>>
>>>> Hi James,
>>>>    Do we have any dependency patches on top of this patch series. I am
>>>> reviewing and testing it, but in both powerpc and x86 system I am
>>>> getting build issue. Not sure if I am missing something> 
>>>> I am trying your changes on top of upstream perf.
>>>>
>>>> pmu-events/arch/test/test_soc/sys/uncore.json: json error Invalid
>>>> character inside JSON string
>>>
>>> Hi Kajol,
>>>
>>> A trailing comma was fixed in this file 3 weeks ago at b8b350a. Can you
>>> confirm if you have updated to get this commit on perf core?
>>>
>>> Alternately you could pull from my branch above which is up to date enough
>>> to include it.
>>
>> Hi James,
>>    Thanks for pointing it. Not getting build issue now.
>>>
>>> The file is in pmu-events/arch/test/ so I would expect it to fail on all platforms.
>>>
>>>> make[3]: *** [pmu-events/Build:18: pmu-events/pmu-events.c] Error 1
>>>> make[3]: *** Deleting file 'pmu-events/pmu-events.c'
>>>> make[2]: *** [Makefile.perf:667: pmu-events/pmu-events-in.o] Error 2
>>>> make[2]: *** Waiting for unfinished jobs....
>>>> make[1]: *** [Makefile.perf:238: sub-make] Error 2
>>>> make: *** [Makefile:70: all] Error 2
>>>>
>>>> Also, Is it possible to add line number along with file name while
>>>> showing this error `json error Invalid character inside JSON string`.
>>>> It might make it easy to fix.
>>>
>>> I can add a character number with the following fix if you think that would
>>> be good enough? A line number might be a bigger change and involve keeping
>>> track of newline characters.
>>
>> Sure. I think then we can skip this change. Not sure if character
>> number will be helpful.
>>
>> Patch-set looks good to me.
>>
>> Reviewed-by Kajol Jain<kjain@...ux.ibm.com>
> 
> Applied ok as-is to my perf/core branch, applied and added your
> Reviewed-by, thanks.
> 

Thanks Arnaldo. This does mean that the arm64 build will fail until
"[PATCH v2 1/3] perf vendor events: Syntax corrections in Neoverse N1 json" is
applied. I think there is also an arm64 build issue with "[PATCH 02/21] perf
pmu: Add const to pmu_events_map." which Andrew Kilroy has replied to.

James