linux-kernel - Re: [PATCH v6 1/7] bits: split the definition of the asm and non-asm GENMASK()

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Message-ID: <85639227-68ed-4a8a-8084-1ae0ffcaa638@wanadoo.fr>
Date: Sat, 8 Mar 2025 18:10:25 +0900
From: Vincent Mailhol <mailhol.vincent@...adoo.fr>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Yury Norov <yury.norov@...il.com>,
 Lucas De Marchi <lucas.demarchi@...el.com>,
 Rasmus Villemoes <linux@...musvillemoes.dk>,
 Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Tvrtko Ursulin
 <tursulin@...ulin.net>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Andrew Morton <akpm@...ux-foundation.org>,
 linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, Andi Shyti <andi.shyti@...ux.intel.com>,
 David Laight <David.Laight@...lab.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v6 1/7] bits: split the definition of the asm and non-asm
 GENMASK()

On 08/03/2025 at 02:42, Andy Shevchenko wrote:
> On Sat, Mar 08, 2025 at 01:48:48AM +0900, Vincent Mailhol via B4 Relay wrote:
>> From: Vincent Mailhol <mailhol.vincent@...adoo.fr>
>>
>> In an upcoming change, GENMASK() and its friends will indirectly
>> depend on sizeof() which is not available in asm.
>>
>> Instead of adding further complexity to __GENMASK() to make it work
>> for both asm and non asm, just split the definition of the two
>> variants.
> 
> ...
> 
>> -/*
>> - * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
>> - * disable the input check if that is the case.
>> - */
> 
>> +/*
>> + * BUILD_BUG_ON_ZERO() is not available in h files included from asm files, so
>> + * no input checks in assembly.
>> + */
> 
> In case of a new version I would reformat this as
> 
> /*
>  * BUILD_BUG_ON_ZERO() is not available in h files included from asm files,
>  * so no input checks in assembly.
>  */
> 
> It makes easier to review the changes and see that the first line is kept
> the same.

Not fully convinced, but why not. I staged this change locally, it will
be in v7.


Yours sincerely,
Vincent Mailhol