Re: [tip:x86/mm] x86, mm: Use a bitfield to mask nuisance get_user() warnings

From: H.J. Lu
Date: Tue Feb 12 2013 - 13:29:39 EST

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.

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