linux-kernel - Re: gcc-4.6.0 generates no code for sub_preempt

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Message-ID: <BANLkTinj1vtMk4qo-dc46KWXScjDDt4vCg@mail.gmail.com>
Date:	Thu, 14 Apr 2011 21:43:23 +0700
From:	masterkom masterkom <masterkom33@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: gcc-4.6.0 generates no code for sub_preempt_count()

Hi,, I have the project to make Operating System using linux kernel.
That system is multiplatform, which is combine linux and window . This
project hope All people that who has familiar with windows can use
this operating system without sin. This project is free..

I hape there people can help us to done this project ,, thx,,,

On 4/14/11, Richard Weinberger <richard@....at> wrote:
> 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?
> Thanks,
> //richard
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