linux-kernel - Re: [PATCH 0/10] Tree fixes for PARAVIRT

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Date:	Fri, 18 Jan 2008 23:02:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Zachary Amsden <zach@...are.com>
Cc:	Glauber de Oliveira Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	glommer@...il.com, tglx@...utronix.de, ehabkost@...hat.com,
	jeremy@...p.org, avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org,
	hpa@...or.com, roland@...hat.com, mtosatti@...hat.com
Subject: Re: [PATCH 0/10] Tree fixes for PARAVIRT


* Zachary Amsden <zach@...are.com> wrote:

> > but in exchange you broke all of 32-bit with CONFIG_PARAVIRT=y. 
> > Which means you did not even build-test it on 32-bit, let alone boot 
> > test it...
> 
> Why are we rushing so much to do 64-bit paravirt that we are breaking 
> working configurations?  If the developement is going to be this 
> chaotic, it should be done and tested out of tree until it can 
> stabilize.

what you see is a open feedback cycle conducted on lkml. People send 
patches for arch/x86, and we tell them if it breaks something. The bug 
was found before i pushed out the x86.git devel tree (and the fix is 
below - but this shouldnt matter to you because the bug never hit a 
public x86.git tree).

	Ingo

Index: linux/include/asm-x86/paravirt.h
===================================================================
--- linux.orig/include/asm-x86/paravirt.h
+++ linux/include/asm-x86/paravirt.h
@@ -619,6 +619,7 @@ static inline void write_cr4(unsigned lo
 	PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
 }
 
+#ifdef CONFIG_X86_64
 static inline unsigned long read_cr8(void)
 {
 	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
@@ -628,6 +629,7 @@ static inline void write_cr8(unsigned lo
 {
 	PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
 }
+#endif
 
 static inline void raw_safe_halt(void)
 {
--
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