Re: [PATCH v2 0/3] Inline helpers into Rust without full LTO

Hi Arnd,

On Fri, 27 Mar 2026 at 10:02, Arnd Bergmann <[email protected]> wrote:
> On Fri, Mar 27, 2026, at 08:56, Geert Uytterhoeven wrote:
> >> I noticed a similar issue with m68k-linux, which has a bitfield
> >> alignment different from anything else on gcc, but uses the normal
> >> behavior on clang.
> >
> > Ugh, I wasn't aware of that. Adrian, did you know?
>
> To clarify, this illustrates what I mean here:
>
> echo 'struct { short a : 3; short b :15; short c :14; } x; int y = sizeof(x);' | m68k-linux-gcc -xc - -S -o-
>
> this produces '4' on m68k-linux-gcc, but '6' everywhere else. I originally
> thought this was related to this 2009 change in both compilers

Oh, now I remember.  AFAIK (holding wood and a rabbit leg) we don't
have any bitfield members spanning multiple base type instances in
the kernel.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds