linux-kernel - Re: [PATCH V2 1/2] uapi: Define GENMASK

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Message-Id: <14f622a9-599a-4b63-8830-0bc825f7c468@app.fastmail.com>
Date: Wed, 31 Jul 2024 19:16:49 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Yury Norov" <yury.norov@...il.com>,
 "Anshuman Khandual" <anshuman.khandual@....com>
Cc: linux-kernel@...r.kernel.org, "Andrew Morton" <akpm@...ux-foundation.org>,
 "Rasmus Villemoes" <linux@...musvillemoes.dk>,
 Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH V2 1/2] uapi: Define GENMASK_U128

On Wed, Jul 31, 2024, at 18:38, Yury Norov wrote:

> OK then, I see. So, is that a GCC bug or intentional behavior? 

I just double-checked to see what is in C23 and found that
it indeed defines a 'wb' and 'wbu' suffix for arbitrarily
sized integers. This is supported by gcc-14 and clang-15
or higher on 64-bit architectures.

It's too early to rely on those versions though, as gcc-14
was only just released.

     Arnd