linux-kernel - Re: [PATCH v3 0/2] perf symbol: Minor fixing

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Message-ID: <CAM9d7chkrqr4P5AMRYw48JcDNsrGSMRKhwyamY5NAWbuF6jttw@mail.gmail.com>
Date:   Mon, 25 Jul 2022 09:54:21 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        Chang Rui <changruinj@...il.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/2] perf symbol: Minor fixing

Hi Leo,

On Sat, Jul 23, 2022 at 11:00 PM Leo Yan <leo.yan@...aro.org> wrote:
>
> This patch set contains two minor fixing for parsing symbols.
>
> The first patch changes to use program header for parsing symbols of
> user space executable and shared objects.  Since kernel's symbol parsing
> is more complex than userspace for support both kernel symbols and module
> symbols, this is why this patch set uses conservative way and doesn't
> change kernel symbols parsing.
>
> The second patch is to detect symbols from sections without setting
> attribute flag SHF_ALLOC, these symbols are used for linker warning,
> skip to record them to avoid spurious symbols.
>
> Changes from v2:
> - Changed to use more gernal way to check the attribute bit SHF_ALLOC
>   for sections rather than check the section string name (Fangrui).
>
> Changes from v1:
> - Changed to use program header / PT_LOAD segments to parse symbols for
>   userspace executable and shared object files (Fangrui).
>
>
> Leo Yan (2):
>   perf symbol: Correct address for bss symbols
>   perf symbol: Skip symbols if SHF_ALLOC flag is not set

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


>
>  tools/perf/util/symbol-elf.c | 56 +++++++++++++++++++++++++++++++++---
>  1 file changed, 52 insertions(+), 4 deletions(-)
>
> --
> 2.25.1
>