Re: [PATCH v5 3/9] bitops: unify non-atomic bitops prototypes across architectures

[Geert Uytterhoeven]

On Fri, Jun 24, 2022 at 2:13 PM Alexander Lobakin
<alexandr.lobakin@xxxxxxxxx> wrote:
> Currently, there is a mess with the prototypes of the non-atomic
> bitops across the different architectures:
>
> ret     bool, int, unsigned long
> nr      int, long, unsigned int, unsigned long
> addr    volatile unsigned long *, volatile void *
>
> Thankfully, it doesn't provoke any bugs, but can sometimes make
> the compiler angry when it's not handy at all.
> Adjust all the prototypes to the following standard:
>
> ret     bool                            retval can be only 0 or 1
> nr      unsigned long                   native; signed makes no sense
> addr    volatile unsigned long *        bitmaps are arrays of ulongs
>
> Next, some architectures don't define 'arch_' versions as they don't
> support instrumentation, others do. To make sure there is always the
> same set of callables present and to ease any potential future
> changes, make them all follow the rule:
>  * architecture-specific files define only 'arch_' versions;
>  * non-prefixed versions can be defined only in asm-generic files;
> and place the non-prefixed definitions into a new file in
> asm-generic to be included by non-instrumented architectures.
>
> Finally, add some static assertions in order to prevent people from
> making a mess in this room again.
> I also used the %__always_inline attribute consistently, so that
> they always get resolved to the actual operations.
>
> Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
> Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
> Reviewed-by: Yury Norov <yury.norov@xxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>

>  arch/m68k/include/asm/bitops.h                | 49 ++++++++++-----

Reviewed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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