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

From: Ingo Molnar
Date: Tue Feb 12 2013 - 03:10:47 EST

* H. Peter Anvin <hpa@xxxxxxxxx> 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@xxxxxxxxx> 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.


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