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Message-ID: <CAMuHMdWqxqg7JubLK=KOX-V8JjoMbEKRPON+WhST=GKcjn8Y+w@mail.gmail.com>
Date: Wed, 6 Jul 2022 12:07:33 +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>,
alpha <linux-alpha@...r.kernel.org>,
"open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
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Subject: Re: [PATCH v3 3/7] bitops: unify non-atomic bitops prototypes across architectures
On Fri, Jun 17, 2022 at 7:09 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>
> 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
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