linux-kernel - Re: [RFC PATCH v2 00/12] Rewrite asm-generic/bitops/{atomic,lock}.h and use on arm64

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Date:   Mon, 19 Mar 2018 17:21:47 +0000
From:   Will Deacon <will.deacon@....com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v2 00/12] Rewrite asm-generic/bitops/{atomic,lock}.h
 and use on arm64

Hi Masahiro,

On Mon, Mar 12, 2018 at 12:56:28PM +0900, Masahiro Yamada wrote:
> 2018-03-01 16:16 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> > 2018-02-27 0:04 GMT+09:00 Will Deacon <will.deacon@....com>:
> >> Hi everyone,
> >>
> >> This is version two of the RFC I previously posted here:
> >>
> >>   https://www.spinics.net/lists/arm-kernel/msg634719.html
> >>
> >> Changes since v1 include:
> >>
> >>   * Fixed __clear_bit_unlock to work on archs with lock-based atomics
> >>   * Moved lock ops into bitops/lock.h
> >>   * Fixed build breakage on lesser-spotted architectures
> >>
> >> Trying to fix the circular #includes introduced by pulling atomic.h
> >> into btops/lock.h has been driving me insane. I've ended up moving some
> >> basic BIT definitions into bits.h, but this might all be better in
> >> const.h which is being proposed by Masahiro. Feedback is especially
> >> welcome on this part.
> >
> >
> > Info for reviewers:
> >
> > You can see my patches at the following:
> >
> > 1/5: https://patchwork.kernel.org/patch/10235457/
> > 2/5: https://patchwork.kernel.org/patch/10235461/
> > 3/5: https://patchwork.kernel.org/patch/10235463/
> > 4/5: https://patchwork.kernel.org/patch/10235469/
> > 5/5: https://patchwork.kernel.org/patch/10235471/
> >
> >
> > 5/5 has conflict with Will's 2/12.
> >
> > Fortunately, it is at the tail of the series.
> > It is easy to pick/drop/change
> > when we decide how to organize it.
> 
> 
> No comments so far about this part.
> 
> I think your approach is better
> since putting BIT* macros into a single header
> is more consistent.
> 
> So, I will ask Andrew to drop mine.

Thanks.

> However, I think <linux/bits.h> will make more sense
> than <asm-generic/bits.h>
> 
> These macros are really arch-agnostic.
> So, we would not expect to have <asm/bits.h>
> that could fall back to <asm-generic/bits.h>, right?

That's fair. I'll do a respin using linux/*.

Cheers,

Will