linux-kernel - Re: um: WARNING: at kernel/futex.c:786 __unqueue

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Date:	Thu, 17 Mar 2011 19:25:36 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	laijs@...fujitsu.com, LKML <linux-kernel@...r.kernel.org>,
	user-mode-linux-devel@...ts.sourceforge.net, dvhart@...ux.intel.com
Subject: Re: um: WARNING: at kernel/futex.c:786 __unqueue_futex

On Thu, Mar 17, 2011 at 19:16, Steven Rostedt <rostedt@...dmis.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?

No.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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