linux-kernel - Re: [PATCH 1/5] um: Use __i386__ in ifdef for vsyscall exports, not SUBARCH

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Date:	Mon, 01 Aug 2011 00:09:15 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	richard -rw- weinberger <richard.weinberger@...il.com>,
	Arnaud Lacombe <lacombar@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [PATCH 1/5] um: Use __i386__ in ifdef for vsyscall exports, not
 SUBARCH_i386

On Sun, 2011-07-31 at 23:48 +0100, Al Viro wrote:
> Hell, no.  If you want to do it, do it the right way.  See #x86_merge in
> git://git.kernel.org/pub/scm/linux/kernel/git/viro/um-header.git/

 255 files changed, 6848 insertions(+), 7816 deletions(-)

Absolutely, but slightly out of scope for what I was trying to do :)

I just posted a *minimal* set of changes to make the UML build system
cope; fixing the code as you've done is *definitely* the better option.
Is there a reason it didn't go upstream yet?

It just wants this, to make the CONFIG_64BIT option visible when
SUBARCH=x86 and also put it *first*.

diff --git a/arch/um/Kconfig.x86 b/arch/um/Kconfig.x86
index d31ecf3..630db12 100644
--- a/arch/um/Kconfig.x86
+++ b/arch/um/Kconfig.x86
@@ -1,5 +1,19 @@
 mainmenu "User Mode Linux/$SUBARCH $KERNELVERSION Kernel Configuration"
 
+config 64BIT
+	bool "Build 64-bit kernel" if SUBARCH = "x86"
+	default SUBARCH != "i386"
+        ---help---
+          Say yes to build a 64-bit kernel - formerly known as x86_64
+          Say no to build a 32-bit kernel - formerly known as i386
+
+config X86_32
+	def_bool !64BIT
+	select HAVE_AOUT
+
+config X86_64
+	def_bool 64BIT
+
 source "arch/um/Kconfig.common"
 
 menu "UML-specific options"
@@ -18,17 +32,6 @@ config UML_X86
 	def_bool y
 	select GENERIC_FIND_FIRST_BIT
 
-config 64BIT
-	bool
-	default SUBARCH = "x86_64"
-
-config X86_32
-	def_bool !64BIT
-	select HAVE_AOUT
-
-config X86_64
-	def_bool 64BIT
-
 config RWSEM_XCHGADD_ALGORITHM
 	def_bool X86_XADD && 64BIT
 

-- 
dwmw2

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