linux-kernel - Re: 2.6.19-rc5-mm2: paravirt X86

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Message-Id: <20061128153635.abaeb1fc.randy.dunlap@oracle.com>
Date:	Tue, 28 Nov 2006 15:36:35 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Adrian Bunk <bunk@...sta.de>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	linux-kernel@...r.kernel.org, zippel@...ux-m68k.org
Subject: Re: 2.6.19-rc5-mm2: paravirt X86_PAE=y compile error

On Wed, 15 Nov 2006 15:36:14 -0800 Andrew Morton wrote:

> On Thu, 16 Nov 2006 00:16:26 +0100
> Adrian Bunk <bunk@...sta.de> wrote:
> 
> > Paravirt breaks CONFIG_X86_PAE=y compilation:
> > 
> > <--  snip  -->
> > 
> > ...
> >   CC      init/main.o
> > In file included from include2/asm/pgtable.h:245,
> >                  from 
> > /home/bunk/linux/kernel-2.6/linux-2.6.19-rc5-mm2/include/linux/mm.h:40,
> >                  from 
> > /home/bunk/linux/kernel-2.6/linux-2.6.19-rc5-mm2/include/linux/poll.h:11,
> >                  from 
> > /home/bunk/linux/kernel-2.6/linux-2.6.19-rc5-mm2/include/linux/rtc.h:113,
> >                  from 
> > /home/bunk/linux/kernel-2.6/linux-2.6.19-rc5-mm2/include/linux/efi.h:19,
> >                  from 
> > /home/bunk/linux/kernel-2.6/linux-2.6.19-rc5-mm2/init/main.c:43:
> > include2/asm/pgtable-3level.h:108: error: redefinition of 'pte_clear'
> > include2/asm/paravirt.h:365: error: previous definition of 'pte_clear' was here
> > include2/asm/pgtable-3level.h:115: error: redefinition of 'pmd_clear'
> > include2/asm/paravirt.h:370: error: previous definition of 'pmd_clear' was here
> > make[2]: *** [init/main.o] Error 1
> > 
> 
> So it does.  Zach will save us.
> 
> How come allmodconfig doesn't select highmem?

Must be because of "choice" and its default:

choice
	prompt "High Memory Support"
	default NOHIGHMEM

Changing the default fixes it.  I suppose conf.c could be
hacked to do something different on choices, but it's not
clear how/what to do there as a general rule.

---
From: Randy Dunlap <randy.dunlap@...cle.com>

Make ix86 default to HIGHMEM4G instead of NOHIGHMEM.

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 arch/i386/Kconfig |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.19-rc6-git10.orig/arch/i386/Kconfig
+++ linux-2.6.19-rc6-git10/arch/i386/Kconfig
@@ -443,7 +443,8 @@ source "drivers/firmware/Kconfig"
 
 choice
 	prompt "High Memory Support"
-	default NOHIGHMEM
+	default HIGHMEM4G if !X86_NUMAQ
+	default HIGHMEM64G if X86_NUMAQ
 
 config NOHIGHMEM
 	bool "off"

-
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