linux-kernel - [PATCH] fix UML on x86-64

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Date:	Tue, 6 May 2008 19:04:43 -0400
From:	Ulrich Drepper <drepper@...hat.com>
To:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Cc:	akpm@...ux-foundation.org, mingo@...e.hu, tglx@...utronix.de,
	torvalds@...ux-foundation.org
Subject: [PATCH] fix UML on x86-64

This patch breaks UML for me on x86-64 running Fedora 8 (gcc 4.1.2):

commit 22eecde2f9034764a3fd095eecfa3adfb8ec9a98
Author: Ingo Molnar <mingo@...e.hu>
Date:   Thu May 1 12:06:54 2008 +0200

    uml: fix gcc problem
    
    this is what caused gcc 4.3 to throw an internal error when
    OPTIMIZE_INLINING was enabled ...
    
    Signed-off-by: Ingo Molnar <mingo@...e.hu>
    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>


If you want to use the option for gcc 4.3 then do it, but only for those
versions.  I haven't tested whether gcc 4.2 and 4.3 works, I just know
that gcc 4.1.2 needs the option for some reason.


Signed-off-by: Ulrich Drepper <drepper@...hat.com>

diff --git a/arch/um/Makefile b/arch/um/Makefile
index 01b97c1..3f52a8c 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -77,9 +77,9 @@ include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
 			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
 KBUILD_CFLAGS += $(KERNEL_DEFINES)
-# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
+# Disable unit-at-a-time mode on pre-gcc-4.3 compilers, it makes gcc use
 # a lot more stack due to the lack of sharing of stacklots:
-KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
+KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0430 ] ; then \
 			echo $(call cc-option,-fno-unit-at-a-time); fi ;)
 
 PHONY += linux
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