linux-kernel - Re: [PATCH v3] kconfig.h: Include compiler types to avoid missed struct attributes

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Message-ID: <CA+55aFxDh-69p0Lr52icct6-3PGcsHaZmMqHwks8HptdmdxvTg@mail.gmail.com>
Date:   Thu, 22 Feb 2018 10:04:52 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Patrick McLean <chutzpah@...too.org>,
        "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] kconfig.h: Include compiler types to avoid missed
 struct attributes

On Thu, Feb 22, 2018 at 9:41 AM, Kees Cook <keescook@...omium.org> wrote:
>
> Updated to include Tested-by. Linus, this looks ready to go.

Ok, applied.

I'm a bit worried that this ends up bypassing our automatic dependency
generation.

Lookie here (in a fully built tree):

    find . -name '*.o.cmd' |
        xargs grep -L linux/compiler_types.h |
        xargs grep -l linux/kconfig.h |
        while read i; do
            j=$(echo $i | sed 's/\.o.cmd$/\.c/' | sed 's:/\.:/:');
            test -f $j && echo $j;
        done

shows that a number of files don't end up depending on that header
file, even though it's included (that "grep -l linux/kconfig,h"
triggers on the command itself having that "-include linux/kconfig.h"
line).

It looks like "gcc -M" just doesn't list any files that get included
on the command line with "-include".

Now, there are very *few* files that don't end up eventually including
linux/compiler_types.h _some_ way, and I checked them all, and they
really are so trivial that this doesn't matter.

But it worries me a bit regardless.

              Linus