Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings
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- Subject: Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings
- From: "H.J. Lu" <hjl.tools@xxxxxxxxx>
- Date: Tue, 12 Feb 2013 10:29:33 -0800
- Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jamie Lokier <jamie@xxxxxxxxxxxxx>, ville.syrjala@xxxxxxxxxxxxxxx, Borislav Petkov <bp@xxxxxxxxx>, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <511A8922.6050908@zytor.com>
On Tue, Feb 12, 2013 at 10:25 AM, H. Peter Anvin <hpa@xxxxxxxxx> 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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