linux-kernel - Re: [PATCH v3 1/3] bits: introduce fixed-type genmasks

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Date: Thu, 29 Feb 2024 20:27:30 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Lucas De Marchi <lucas.demarchi@...el.com>
Cc: Yury Norov <yury.norov@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	intel-xe@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH v3 1/3] bits: introduce fixed-type genmasks

On Thu, Feb 29, 2024 at 12:21:34PM -0600, Lucas De Marchi wrote:
> On Thu, Feb 29, 2024 at 12:49:57PM +0200, Andy Shevchenko wrote:
> > On Wed, Feb 28, 2024 at 05:39:21PM -0600, Lucas De Marchi wrote:
> > > On Thu, Feb 22, 2024 at 06:49:59AM -0800, Yury Norov wrote:

..

> > > I build-tested this in x86-64, x86-32 and arm64. I didn't like much the
> > > need to fork the __GENMASK() implementation on the 2 sides of the ifdef
> > > since I think the GENMASK_INPUT_CHECK() should be the one covering the
> > > input checks. However to make it common we'd need to solve 2 problems:
> > > the casts and the sizeof. The sizeof can be passed as arg to
> > > __GENMASK(), however the casts I think would need a __CAST_U8(x)
> > > or the like and sprinkle it everywhere, which would hurt readability.
> > > Not pretty. Or go back to the original submission and make it less
> > > horrible :-/
> > 
> > I'm wondering if we can use _Generic() approach here.
> 
> in assembly?

Yes.

-- 
With Best Regards,
Andy Shevchenko