linux-kernel - Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get

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Message-ID: <CA+55aFxaUUMQuw3bgLbZLARp05eM19E_qTXBYePPk9mvEsSp=g@mail.gmail.com>
Date:	Mon, 11 Feb 2013 19:33:02 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jamie Lokier <jamie@...reable.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	ville.syrjala@...ux.intel.com, Borislav Petkov <bp@...en8.de>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings

On Mon, Feb 11, 2013 at 5:37 PM, tip-bot for H. Peter Anvin
<hpa@...or.com> wrote:
>
> However, we can declare a bitfield using sizeof(), which is legal
> because sizeof() is a constant expression.  This quiets the warning,
> although the code generated isn't 100% identical from the baseline
> before 96477b4 x86-32: Add support for 64bit get_user():

Christ. This is so ugly that it's almost a work of art.

Has anybody run this past any gcc developers? And if so, did they run
away screaming?

                 Linus
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