From: Nick Desaulniers <ndesaulniers@google.com>
To: Will Deacon <will@kernel.org>
Cc: linux-kernel@vger.kernel.org, kernel-team@android.com,
Masahiro Yamada <masahiroy@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nicolas@fjasle.eu>,
Josh Poimboeuf <jpoimboe@kernel.org>,
John Stultz <jstultz@google.com>,
linux-kbuild@vger.kernel.org
Subject: Re: [PATCH v4 1/3] scripts/faddr2line: Don't filter out non-function symbols from readelf
Date: Mon, 18 Sep 2023 08:51:13 -0700 [thread overview]
Message-ID: <CAKwvOdmJa5WFLw=YZWAEu=o+3dkUgVNrwNWDZLC=k2Be=Bcy3Q@mail.gmail.com> (raw)
In-Reply-To: <20230914131225.13415-2-will@kernel.org>
On Thu, Sep 14, 2023 at 6:12 AM Will Deacon <will@kernel.org> wrote:
>
> As Josh points out in 20230724234734.zy67gm674vl3p3wv@treble:
Perhaps a suggested-by tag would be appropriate then? Next time.
>
> > Problem is, I think the kernel's symbol printing code prints the
> > nearest kallsyms symbol, and there are some valid non-FUNC code
> > symbols. For example, syscall_return_via_sysret.
>
> so we shouldn't be considering only 'FUNC'-type symbols in the output
> from readelf.
>
> Drop the function symbol type filtering from the faddr2line outer loop.
>
> Cc: Josh Poimboeuf <jpoimboe@kernel.org>
> Cc: John Stultz <jstultz@google.com>
> Link: https://lore.kernel.org/r/20230724234734.zy67gm674vl3p3wv@treble
> Signed-off-by: Will Deacon <will@kernel.org>
LGTM; thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> scripts/faddr2line | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/faddr2line b/scripts/faddr2line
> index 0e73aca4f908..a35a420d0f26 100755
> --- a/scripts/faddr2line
> +++ b/scripts/faddr2line
> @@ -260,7 +260,7 @@ __faddr2line() {
>
> DONE=1
>
> - done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$4 == "FUNC" && $8 == fn')
> + done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
> }
>
> [[ $# -lt 2 ]] && usage
> --
> 2.42.0.283.g2d96d420d3-goog
>
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2023-09-18 16:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-14 13:12 [PATCH v4 0/3] Fix 'faddr2line' for LLVM arm64 builds Will Deacon
2023-09-14 13:12 ` [PATCH v4 1/3] scripts/faddr2line: Don't filter out non-function symbols from readelf Will Deacon
2023-09-18 15:51 ` Nick Desaulniers [this message]
2023-09-14 13:12 ` [PATCH v4 2/3] scripts/faddr2line: Use LLVM addr2line and readelf if LLVM=1 Will Deacon
2023-09-14 15:55 ` Nick Desaulniers
2023-09-14 13:12 ` [PATCH v4 3/3] scripts/faddr2line: Skip over mapping symbols in output from readelf Will Deacon
2023-09-18 15:46 ` Nick Desaulniers
2023-10-02 15:26 ` Will Deacon
2023-09-25 16:50 ` Masahiro Yamada
2023-09-29 14:15 ` Will Deacon
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