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

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Message-ID: <CAMj1kXHogmW9ZAZ8M3VtXvBvRrZ9L8DANmW0_rZ8TUx0DE9EaQ@mail.gmail.com>
Date: Wed, 24 Jul 2024 12:33:38 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, 
	Yury Norov <yury.norov@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, 
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org
Subject: Re: [PATCH 0/2] uapi: Add support for GENMASK_U128()

Hi Anshuman,

On Wed, 24 Jul 2024 at 12:31, 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.
>
> Question:
>
> Proposed GENMASK_U128() depends on __int128 data type being supported in
> the compiler. Just wondering if that requires some compiler version #ifdefs
> or something similar ?
>

CONFIG_ARCH_SUPPORTS_INT128 comes to mind