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

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Message-ID: <20130212081028.GA19250@gmail.com>
Date:	Tue, 12 Feb 2013 09:10:28 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jamie Lokier <jamie@...reable.org>,
	ville.syrjala@...ux.intel.com, Borislav Petkov <bp@...en8.de>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-tip-commits@...r.kernel.org, "H.J. Lu" <hjl.tools@...il.com>
Subject: Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user()
 warnings


* H. Peter Anvin <hpa@...or.com> wrote:

> On 02/11/2013 07:33 PM, Linus Torvalds wrote:
> > 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.
> 
> :)

A real possibility would be that if this ever breaks in a GCC 
version, or generates some really crappy code, we might get a 
"you got what you asked for" shrug from GCC developers?

It's not like we could start a revolution over that.

Thanks,

	Ingo
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