From: Richard Weinberger <richard@nod.at>
To: Mikael Pettersson <mikpe@it.uu.se>
Cc: linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: gcc-4.6.0 generates no code for sub_preempt_count()
Date: Thu, 14 Apr 2011 15:52:41 +0200 [thread overview]
Message-ID: <201104141552.42213.richard@nod.at> (raw)
In-Reply-To: <19878.42746.60978.537126@pilspetsen.it.uu.se>
Am Donnerstag 14 April 2011, 09:49:14 schrieb Mikael Pettersson:
> Richard Weinberger writes:
> > Hi,
> >
> > I'm facing a very strange issue with gcc-4.6.0 and UML.
> > Within __local_bh_enable() gcc generates no code for
> > sub_preempt_count().
> >
> > See:
> > http://userweb.kernel.org/~rw/uml-gcc460/__local_bh_enable-gcc460.txt
> > vs.
> > http://userweb.kernel.org/~rw/uml-gcc460/__local_bh_enable-gcc431.txt
> >
> > Interestingly it generates code for add_preempt_count().
> > I can reproduce this on x86 and x86_64.
> >
> > The problem has to do with UML's current_thread_info() function.
> > When I replace it with arch/x86's (unportable) variant gcc generates
> > code.
> >
> > Any ideas whether this is a gcc or a kernel issue?
>
> Please provide a standalone test case.
There you go!
http://userweb.kernel.org/~rw/uml-gcc460/testcase.c
Thanks,
//richard
next prev parent reply other threads:[~2011-04-14 13:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 19:50 gcc-4.6.0 generates no code for sub_preempt_count() Richard Weinberger
2011-04-14 7:49 ` Mikael Pettersson
2011-04-14 13:52 ` Richard Weinberger [this message]
2011-04-14 19:50 ` [uml-devel] " James McMechan
2011-04-15 15:17 ` Richard Weinberger
2011-04-14 14:43 ` masterkom masterkom
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