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

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Message-ID: <20080109152208.GA21280@elte.hu>
Date:	Wed, 9 Jan 2008 16:22:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	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


* 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.

> 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.

	Ingo
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