Le jeudi 17 mars 2011 à 19:25 +0100, Geert Uytterhoeven a écrit :
> On Thu, Mar 17, 2011 at 19:16, Steven Rostedt <rost...@goodmis.org> wrote:
> > On Thu, 2011-03-17 at 18:02 +0100, Eric Dumazet wrote:
> >> Le jeudi 17 mars 2011 à 12:55 -0400, Steven Rostedt a écrit :
> >> > Here, test this patch. I'm in the process of committing it now.
> >> > It will be two patches, one for the WARN_ON_SMP() change, the other for
> >> > the futex change.
> >> >
> >> > -- Steve
> >> >
> >> > diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
> >> > index c2c9ba0..25f1e9e 100644
> >> > --- a/include/asm-generic/bug.h
> >> > +++ b/include/asm-generic/bug.h
> >> > @@ -168,7 +168,7 @@ extern void warn_slowpath_null(const char *file,
> >> > const int line);
> >> > #ifdef CONFIG_SMP
> >> > # define WARN_ON_SMP(x) WARN_ON(x)
> >> > #else
> >> > -# define WARN_ON_SMP(x) do { } while (0)
> >> > +# define WARN_ON_SMP(x) ({0;})
> >> > #endif
> >> >
> >>
> >> You meant :
> >>
> >> # define WARN_ON_SMP(x) ({x;})
> >>
> >> or
> >>
> >> # define WARN_ON_SMP(x) do { } while (x, 0)
> >>
> >> ?
> >>
> >
> > Does if (do { } while (x, 0)) work?
>
My point was that WARN_ON(X) always evaluates X once
And apparently, WARN_ON_SMP(X) doesnt evaluates X iF !SMP
This should be documented, or fixed ;)
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