linux-kernel - Re: More breakage in native_rdtsc out of line in git-x86

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Date:	Wed, 9 Jan 2008 16:51:24 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: More breakage in native_rdtsc out of line in git-x86

On Wed, Jan 09, 2008 at 04:22:08PM +0100, Ingo Molnar wrote:
> 
> * Andi Kleen <andi@...stfloor.org> wrote:
> 
> > > nope, it's a 64-bit setup/dependency bug/problem: the vsyscall mappings 
> > > are installed via an __initcall, and that's too late for early use. The 
> > > combo patch below fixed the crash for me, does it work on your box too?
> > 
> > That gives
> > 
> > /home/lsrc/quilt/linux/arch/x86/kernel/setup_64.c: In function 'setup_arch':
> > /home/lsrc/quilt/linux/arch/x86/kernel/setup_64.c:468: error: implicit declarati
> > on of function 'map_vsyscall'
> 
> i guess you have an old repository.

I just applied the patch you sent out against yesterday's git-x86.

> 
> > But after I add a prototype to vsyscall.h it seems to work.
> > 
> > Just the barriers are still broken [...]
> 
> since yesterday there's a full barrier around rdtsc.

Great.

-Andi
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