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

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Date:   Wed, 6 Jul 2022 12:09:33 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Matt Turner <mattst88@...il.com>,
        Brian Cain <bcain@...cinc.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, kernel test robot <lkp@...el.com>,
        alpha <linux-alpha@...r.kernel.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>, llvm@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3/9] bitops: unify non-atomic bitops prototypes across architectures

On Fri, Jun 24, 2022 at 2:13 PM Alexander Lobakin
<alexandr.lobakin@...el.com> 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@...ux.intel.com>
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> Acked-by: Mark Rutland <mark.rutland@....com>
> Reviewed-by: Yury Norov <yury.norov@...il.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

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

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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