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

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Date:   Wed, 5 Jun 2019 15:19:33 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Will Deacon <will.deacon@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 0/2] Allow assembly code to use BIT(), GENMASK(), etc. and
 clean-up arm64 header

Hi Will,

Is this series applicable to arm64 tree?

Thanks.

On Mon, May 27, 2019 at 5:37 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> 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.
>
> 1/2 replaced
>    1UL -> UL(1)
>    0UL -> UL(0)
>    1ULL -> ULL(1)
>    0ULL -> ULL(0)
>
> With this, there is no more restriction that prevents assembly
> code from using them.
>
> 2/2 is a clean-up as as example.
>
> I can contribute to cleanups of arch/s390/, etc.
> once this series lands in upstream.
>
> I hope both patches can go in the arm64 tree.
>
>
>
> 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 ++++---
>  2 files changed, 51 insertions(+), 48 deletions(-)
>
> --
> 2.17.1
>


-- 
Best Regards
Masahiro Yamada