linux-kernel - Re: [PATCH] block: blk-iocost: fix build for ARCH with missing local64.h files

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Date:   Wed, 9 Dec 2020 22:16:20 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Mark Salter <msalter@...hat.com>,
        Aurelien Jacquiot <jacquiot.aurelien@...il.com>,
        linux-c6x-dev@...ux-c6x.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] block: blk-iocost: fix build for ARCH with missing
 local64.h files

On 12/9/20 10:07 PM, Christoph Hellwig wrote:
> On Wed, Dec 09, 2020 at 12:46:57PM -0800, Randy Dunlap wrote:
>> When building block/blk-iocost.c on arch/x6x/ or arch/nios2/, the
>> build fails due to missing the <asm/local64.h> file.
> 
> Please mark it mandatory-y if the asm-generic version is suitable
> for everyone and random pieces of kernel code are supposed to include
> it.

include/asm-generic/local64.h has comments about some $arch could do
its things better/faster instead of using asm-generic, but no $arch has
done that since 2010 when it was added.

Is that conclusive?
If it is, why even use mandatory-y?
Why not just change all occurrences of <asm/local64.h>
to <asm-generic/local64.h> ?


thanks.
-- 
~Randy