linux-kernel - Re: [PATCH v8 00/22] perf arm-spe: Refactor decoding & dumping flow

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Date:   Wed, 11 Nov 2020 13:15:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Andre Przywara <andre.przywara@....com>,
        Dave Martin <Dave.Martin@....com>,
        James Clark <james.clark@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Al Grant <Al.Grant@....com>, Wei Li <liwei391@...wei.com>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/22] perf arm-spe: Refactor decoding & dumping flow

Em Wed, Nov 11, 2020 at 01:10:51PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Nov 11, 2020 at 03:11:27PM +0800, Leo Yan escreveu:
> > This is patch set v8 for refactoring Arm SPE trace decoding and dumping.
> > 
> > This version addresses Andre's comment to pass parameter '&buf_len' at
> > the last call arm_spe_pkt_snprintf() in the function arm_spe_pkt_desc().
> > 
> > This patch set is cleanly applied on the top of perf/core branch
> > with commit 644bf4b0f7ac ("perf jevents: Add test for arch std events").
> > 
> > I retested this patch set on Hisilicon D06 platform with commands
> > "perf report -D" and "perf script", compared the decoding results
> > between with this patch set and without this patch set, "diff" tool
> > shows the result as expected.
> 
> With the patches I applied I'm getting:
> 
> util/arm-spe-decoder/arm-spe-pkt-decoder.c: In function 'arm_spe_pkt_desc':
> util/arm-spe-decoder/arm-spe-pkt-decoder.c:410:3: error: left shift count >= width of type [-Werror]
>    case 1: ns = !!(packet->payload & NS_FLAG);
>    ^
> util/arm-spe-decoder/arm-spe-pkt-decoder.c:411:4: error: left shift count >= width of type [-Werror]
>     el = (packet->payload & EL_FLAG) >> 61;
>     ^
> util/arm-spe-decoder/arm-spe-pkt-decoder.c:411:4: error: left shift count >= width of type [-Werror]
> util/arm-spe-decoder/arm-spe-pkt-decoder.c:416:3: error: left shift count >= width of type [-Werror]
>    case 3: ns = !!(packet->payload & NS_FLAG);
>    ^
>   CC       /tmp/build/perf/util/arm-spe-decoder/arm-spe-decoder.o
>  
> 
> On:
> 
>   16    11.70 android-ndk:r12b-arm          : FAIL arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
>   17    11.32 android-ndk:r15c-arm          : FAIL arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
> 
> That were building ok before, builds still under way, perhaps its just
> on these old systems...

[acme@...e perf]$ git bisect good
cc6fa07fb1458cca3741919774eb050976471000 is the first bad commit
commit cc6fa07fb1458cca3741919774eb050976471000
Author: Leo Yan <leo.yan@...aro.org>
Date:   Wed Nov 11 15:11:28 2020 +0800

    perf arm-spe: Include bitops.h for BIT() macro

    Include header linux/bitops.h, directly use its BIT() macro and remove
    the self defined macros.

    Signed-off-by: Leo Yan <leo.yan@...aro.org>
    Reviewed-by: Andre Przywara <andre.przywara@....com>
    Link: https://lore.kernel.org/r/20201111071149.815-2-leo.yan@linaro.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

 tools/perf/util/arm-spe-decoder/arm-spe-decoder.c     | 5 +----
 tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 3 +--
 2 files changed, 2 insertions(+), 6 deletions(-)
[acme@...e perf]$