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

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Message-ID: <CAMe9rOoZOmcRKaSKsgp0gimHexW3DZCZKugQOztiuOixTZFbUQ@mail.gmail.com>
Date:	Tue, 12 Feb 2013 10:29:33 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.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
Subject: Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings

On Tue, Feb 12, 2013 at 10:25 AM, H. Peter Anvin <hpa@...or.com> wrote:
> I just thought up this variant, I'm about to test it, but H.J., do you
> see any problems with it?
>
> #define itype(x) \
> __typeof__(__builtin_choose_expr(sizeof(*(x)) > sizeof(0UL), 0ULL, 0UL))
>
> I tried it out with a small test program (attached), and it seems to
> work.  Next for using it in the kernel...
>
>         -hpa
>

It looks OK to me.

-- 
H.J.
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