linux-kernel - Re: [PATCH 3/8] scripts/mksysmap: use sed with in-line comments

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Date:   Fri, 7 Apr 2023 11:59:44 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: Re: [PATCH 3/8] scripts/mksysmap: use sed with in-line comments

On Wed, Mar 8, 2023 at 3:53 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Move comments close to the code.

Consider adding to the commit message why you switch from grep to sed;
that's currently unclear.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

Orthogonal to this patch, don't .L prefixed local symbols not have
entries in the symbol table? If they're not printed with nm, why
filter them out (since they're impossible).

>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
>  scripts/mksysmap | 61 +++++++++++++++++++++++++++++-------------------
>  1 file changed, 37 insertions(+), 24 deletions(-)
>
> diff --git a/scripts/mksysmap b/scripts/mksysmap
> index 697fc6653953..8ea1955e03c6 100755
> --- a/scripts/mksysmap
> +++ b/scripts/mksysmap
> @@ -10,32 +10,45 @@
>  #####
>  # Generate System.map (actual filename passed as second argument)
>
> -# For System.map filter away:
> -#   a - local absolute symbols
> -#   U - undefined global symbols
> -#   N - debugging symbols
> -#   w - local weak symbols
> -
>  # readprofile starts reading symbols when _stext is found, and
>  # continue until it finds a symbol which is not either of 'T', 't',
>  # 'W' or 'w'.
>  #
> -# Ignored prefixes:
> -#  $                    - local symbols for ARM, MIPS, etc.
> -#  .L                   - local labels, .LBB,.Ltmpxxx,.L__unnamed_xx,.LASANPC, etc.
> -#  __crc_               - modversions
> -#  __kstrtab_           - EXPORT_SYMBOL (symbol name)
> -#  __kstrtabns_         - EXPORT_SYMBOL (namespace)
> +
> +${NM} -n ${1} | sed >${2} -e "
> +# ---------------------------------------------------------------------------
> +# Ignored symbol types
>  #
> -# Ignored symbols:
> -#  L0                   - for LoongArch?
> -
> -$NM -n $1 | grep -v            \
> -       -e ' [aNUw] '           \
> -       -e ' \$'                \
> -       -e ' \.L'               \
> -       -e ' __crc_'            \
> -       -e ' __kstrtab_'        \
> -       -e ' __kstrtabns_'      \
> -       -e ' L0$'               \
> -> $2
> +
> +# a: local absolute symbols
> +# N: debugging symbols
> +# U: undefined global symbols
> +# w: local weak symbols
> +/ [aNUw] /d
> +
> +# ---------------------------------------------------------------------------
> +# Ignored prefixes
> +#  (do not forget a space before each pattern)
> +
> +# local symbols for ARM, MIPS, etc.
> +/ \$/d
> +
> +# local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc.
> +/ \.L/d
> +
> +# CRC from modversions
> +/ __crc_/d
> +
> +# EXPORT_SYMBOL (symbol name)
> +/ __kstrtab_/d
> +
> +# EXPORT_SYMBOL (namespace)
> +/ __kstrtabns_/d
> +
> +# ---------------------------------------------------------------------------
> +# Ignored symbols (exact match)
> +#  (do not forget a space before and '$' after each pattern)
> +
> +# for LoongArch?
> +/ L0$/d
> +"
> --
> 2.34.1
>


-- 
Thanks,
~Nick Desaulniers