linux-kernel - Re: Linux 5.15

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Message-ID: <CAHk-=wiZgzKMw7AkahZH-iCxJLAadS_nrzVJiCqrsFWfg7n_Xw@mail.gmail.com>
Date:   Mon, 1 Nov 2021 18:44:39 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 5.15

On Mon, Nov 1, 2021 at 6:18 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> Replacing "strlen(UTS_RELEASE)" with "sizeof(UTS_RELEASE) - 1" seems to do
> the trick, at least with gcc 11.2 and v5.15. I just wonder if that would be
> acceptable. Any idea ?

Looks sane to me.

I don't understand why gcc complains about that thing in the first
place, much less why it only happens on m68k, but whatever...

The other - and perhaps better - option would be to just uninline
memcpy_and_pad() entirely, move it to lib/string.c, and only have the
declaration in <linux/string.h>.

Because the only reason to have it as an inline function is when the
compiler can statically optimize a call site: but it's really not a
performance-critical function to begin with, and clearly the compiler
instead just *breaks* rather than optimize that call-site.

               Linus