linux-kernel - Re: [PATCH] kbuild: treat char as always signed

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Message-ID: <Y1BOtMpS5KtL4blg@smile.fi.intel.com>
Date:   Wed, 19 Oct 2022 22:23:32 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-toolchains@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] kbuild: treat char as always signed

On Wed, Oct 19, 2022 at 11:35:50AM -0700, Linus Torvalds wrote:
> On Wed, Oct 19, 2022 at 11:10 AM Nick Desaulniers
> <ndesaulniers@...gle.com> wrote:

...

> We do have a couple of signed bitfields in the kernel, but they are
> unusual enough that it's actually a good thing that sparse just made
> people be explicit about it.

At least drivers/media/usb/msi2500/msi2500.c:289 can be converted
to use sign_extend32() I believe.

-- 
With Best Regards,
Andy Shevchenko