linux-kernel - Re: [PATCH v2 6/7] perf jevents: Switch build to use jevents.py

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Date:   Fri, 13 May 2022 16:37:48 +0100
From:   John Garry <john.garry@...wei.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        "Felix Fietkau" <nbd@....name>, Qi Liu <liuqi115@...wei.com>,
        Like Xu <likexu@...cent.com>, <linux-kernel@...r.kernel.org>,
        <linux-perf-users@...r.kernel.org>,
        Nick Forrington <nick.forrington@....com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        James Clark <james.clark@....com>,
        Andrew Kilroy <andrew.kilroy@....com>,
        "Paul A . Clarke" <pc@...ibm.com>, Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        <ananth.narayan@....com>, <ravi.bangoria@....com>,
        <santosh.shukla@....com>, <sandipan.das@....com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Kshipra Bopardikar <kshipra.bopardikar@...el.com>
CC:     Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 6/7] perf jevents: Switch build to use jevents.py

On 11/05/2022 22:15, Ian Rogers wrote:
>    # jevents.py uses os.scandir and type hints present in Python 3.5 released in Sept. 2015.
> +    JEVENTS_PYTHON_GOOD := $(shell $(PYTHON) -c 'import sys;print("1" if(sys.version_info.major >= 3 and sys.version_info.minor >= 5) else "0")')

I think that many - like me - will have python 2.7, so now will find no 
pmu-events generated any longer after missing this message in the build :(

Maybe many will have python >= 3.5 - but I don't know...

 > + ifneq ($(JEVENTS_PYTHON_GOOD), 1)
 > + $(warning Python interpreter too old (older than 3.5) disabling 
jevent generation)
 > + NO_JEVENTS := 1

It is possible to flip NO_JEVENTS to be JEVENTS, i.e. no 
double-negatives, like NO_JEVENTS := 0

 > + endif

Thanks,
John