From: Mikael Pettersson <mikpe@it.uu.se>
To: Richard Weinberger <richard@nod.at>
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 09:49:14 +0200 [thread overview]
Message-ID: <19878.42746.60978.537126@pilspetsen.it.uu.se> (raw)
In-Reply-To: <201104132150.05623.richard@nod.at>
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.
next prev parent reply other threads:[~2011-04-14 7:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 19:50 Richard Weinberger
2011-04-14 7:49 ` Mikael Pettersson [this message]
2011-04-14 13:52 ` Richard Weinberger
2011-04-14 19:50 ` [uml-devel] " James McMechan
2011-04-15 15:17 ` Richard Weinberger
2011-04-14 14:43 ` masterkom masterkom
2011-04-14 15:17 ` Frank Kingswood
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