linux-kernel - Re: [PATCH V3 0/2] uapi: Add support for GENMASK

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Message-ID: <Zq0YnYAM9RoforVV@yury-ThinkPad>
Date: Fri, 2 Aug 2024 10:34:21 -0700
From: Yury Norov <yury.norov@...il.com>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: linux-kernel@...r.kernel.org, ardb@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org
Subject: Re: [PATCH V3 0/2] uapi: Add support for GENMASK_U128()

On Fri, Aug 02, 2024 at 07:00:43AM +0530, Anshuman Khandual wrote:
> 
> 
> On 8/1/24 20:13, Yury Norov wrote:
> > On Thu, Aug 1, 2024 at 12:16 AM Anshuman Khandual
> > <anshuman.khandual@....com> wrote:
> >>
> >> This adds support for GENMASK_U128() and some corresponding tests as well.
> >> GENMASK_U128() generated 128 bit masks will be required later on the arm64
> >> platform for enabling FEAT_SYSREG128 and FEAT_D128 features.
> >>
> >> Because GENMAKS_U128() depends on __int128 data type being supported in the
> >> compiler, its usage needs to be protected with CONFIG_ARCH_SUPPORTS_INT128.
> >>
> >> Cc: Andrew Morton <akpm@...ux-foundation.org>
> >> Cc: Yury Norov <yury.norov@...il.com>
> >> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> >> Cc: Arnd Bergmann <arnd@...db.de>>
> >> Cc: linux-kernel@...r.kernel.org
> >> Cc: linux-arch@...r.kernel.org
> > 
> > For the patches:
> > 
> > Reviewed-by: Yury Norov <yury.norov@...il.com>
> 
> Thanks Yury.
> 
> > 
> > This series doesn't include a real use-case for the new macros. Do you
> > have some?
> > I can take it via my branch, but I need at least one use-case to not
> > merge dead code.
> 
> I have recently posted the following patch for arm64 platform although
> most of the subsequent work is still in progress. But for now there
> are some corresponding tests for this new GENMASK_U128() ABI as well.
> Hence it will be really great to have these two patches merged first.
> Thank you.
> 
> https://lore.kernel.org/all/20240801054436.612024-1-anshuman.khandual@arm.com/

If you're going to merge the above patch in 6.12, you'd normally send
it together with GENMASK_U128 preparation series, get an ACK from me
and Rasmus for bitops part and move through arm64 tree.

Whatever, I've merged it in bitmap-for-next for testing. Please keep
me posted for any following patches.

Thanks,
Yury