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

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Message-ID: <CAK7LNAT+DVCJ8CbxKYX0yEUdsp-vYU1J+az+yfM9h3-DzoWGgQ@mail.gmail.com>
Date:   Mon, 12 Mar 2018 12:56:28 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Will Deacon <will.deacon@....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 Will,


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.


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?




-- 
Best Regards
Masahiro Yamada