From: Andi Kleen <andi@firstfloor.org>
To: Avi Kivity <avi@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>,
mtosatti@redhat.com, kvm@vger.kernel.org,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH] KVM: Move KVM context switch into own function
Date: Wed, 20 Oct 2010 18:20:41 +0200 [thread overview]
Message-ID: <20101020162041.GF20124@basil.fritz.box> (raw)
In-Reply-To: <4CBF14DB.5020109@redhat.com>
On Wed, Oct 20, 2010 at 06:12:11PM +0200, Avi Kivity wrote:
> On 10/20/2010 05:56 PM, Andi Kleen wrote:
> >From: Andi Kleen<ak@linux.intel.com>
> >
> >gcc 4.5 with some special options is able to duplicate the VMX
> >context switch asm in vmx_vcpu_run(). This results in a compile error
> >because the inline asm sequence uses an on local label. The non local
> >label is needed because other code wants to set up the return address.
> >
>
> Curious, any idea why gcc does that? I guess it's the unlikely()
> near the top.
Don't know why, i wasn't motivated to go through its debugging dumps
for this. But strictly the problem could always happen,
not even a "volatile" stops that.
-Andi
next prev parent reply other threads:[~2010-10-20 16:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 15:56 [PATCH] KVM: Move KVM context switch into own function Andi Kleen
2010-10-20 16:12 ` Avi Kivity
2010-10-20 16:20 ` Andi Kleen [this message]
2010-10-21 17:28 ` Marcelo Tosatti
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