linux-kernel - Re: [PATCH 0/2] Allow assembly code to use BIT(), GENMASK(), etc. and clean-up arm64 header

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Message-ID: <20190605073406.geesp3rbrxajmac6@mbp>
Date:   Wed, 5 Jun 2019 08:34:07 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Allow assembly code to use BIT(), GENMASK(), etc.
 and clean-up arm64 header

On Mon, May 27, 2019 at 05:34:10PM +0900, Masahiro Yamada wrote:
> Some in-kernel headers use _BITUL() instead of BIT().
> 
>  arch/arm64/include/asm/sysreg.h
>  arch/s390/include/asm/*.h
> 
> I think the reason is because BIT() is currently not available
> in assembly. It hard-codes 1UL, which is not available in assembly.
[...]
> Masahiro Yamada (2):
>   linux/bits.h: make BIT(), GENMASK(), and friends available in assembly
>   arm64: replace _BITUL() with BIT()
> 
>  arch/arm64/include/asm/sysreg.h | 82 ++++++++++++++++-----------------
>  include/linux/bits.h            | 17 ++++---

I'm not sure it's worth the hassle. It's nice to have the same BIT macro
but a quick grep shows arc, arm64, s390 and x86 using _BITUL. Maybe a
tree-wide clean-up would be more appropriate.

-- 
Catalin