linux-kernel - Re: [PATCH v3] gen_compile_commands: handle multiple lines per .mod file

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Date:   Tue, 28 Jun 2022 11:45:05 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>, Jason Gunthorpe <jgg@...dia.com>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>
Subject: Re: [PATCH v3] gen_compile_commands: handle multiple lines per .mod file

On Mon, Jun 27, 2022 at 6:24 PM John Hubbard <jhubbard@...dia.com> wrote:
>
> scripts/clang-tools/gen_compile_commands.py incorrectly assumes that
> each .mod file only contains one line. That assumption was correct when
> the script was originally created, but commit 9413e7640564 ("kbuild:
> split the second line of *.mod into *.usyms") changed the .mod file
> format so that there is one entry per line, and potentially many lines.
>
> The problem can be reproduced by using Kbuild to generate
> compile_commands.json, like this:
>
>     make CC=clang compile_commands.json
>
> In many cases, the problem might be overlooked because many subsystems
> only have one line anyway. However, in some subsystems (Nouveau, with
> 762 entries, is a notable example) it results in skipping most of the
> subsystem.
>
> Fix this by fully processing each .mod file.
>
> Fixes: 9413e7640564 ("kbuild: split the second line of *.mod into *.usyms")
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>

Thanks for the fix, John!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>
> Link to v2:
> https://lore.kernel.org/all/20220616021149.327587-1-jhubbard@nvidia.com/
>
> Changes since v2:
>
>   * Restored a blank line.
>
>   * Rewrote the commit description.
>
> thanks,
> John Hubbard
>
>
>  scripts/clang-tools/gen_compile_commands.py | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/clang-tools/gen_compile_commands.py b/scripts/clang-tools/gen_compile_commands.py
> index 1d1bde1fd45e..47da25b3ba7d 100755
> --- a/scripts/clang-tools/gen_compile_commands.py
> +++ b/scripts/clang-tools/gen_compile_commands.py
> @@ -157,10 +157,10 @@ def cmdfiles_for_modorder(modorder):
>              if ext != '.ko':
>                  sys.exit('{}: module path must end with .ko'.format(ko))
>              mod = base + '.mod'
> -           # The first line of *.mod lists the objects that compose the module.
> +            # Read from *.mod, to get a list of objects that compose the module.
>              with open(mod) as m:
> -                for obj in m.readline().split():
> -                    yield to_cmdfile(obj)
> +                for mod_line in m:
> +                    yield to_cmdfile(mod_line.rstrip())
>
>
>  def process_line(root_directory, command_prefix, file_path):
> --
> 2.36.1
>


-- 
Thanks,
~Nick Desaulniers