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Subject[PATCH 4/9] UML - Mark SMP on UML/x86_64 as broken
Date
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Noticed by Al Viro - SMP on x86_64 is fundamentally broken due to
UML's reuse of the host arch's percpu stuff. This is OK on x86, but
the x86_64 pda stuff just won't work for UML.

Signed-off-by: Jeff Dike <jdike@addtoit.com>

Index: linux-2.6.13-rc6/arch/um/Kconfig
===================================================================
--- linux-2.6.13-rc6.orig/arch/um/Kconfig 2005-08-15 12:03:07.000000000 -0400
+++ linux-2.6.13-rc6/arch/um/Kconfig 2005-08-15 14:04:23.000000000 -0400
@@ -196,7 +196,7 @@
config SMP
bool "Symmetric multi-processing support (EXPERIMENTAL)"
default n
- depends on MODE_TT && EXPERIMENTAL
+ depends on (MODE_TT && EXPERIMENTAL && !SMP_BROKEN) || (BROKEN && SMP_BROKEN)
help
This option enables UML SMP support.
It is NOT related to having a real SMP box. Not directly, at least.
Index: linux-2.6.13-rc6/arch/um/Kconfig_x86_64
===================================================================
--- linux-2.6.13-rc6.orig/arch/um/Kconfig_x86_64 2005-08-08 12:11:18.000000000 -0400
+++ linux-2.6.13-rc6/arch/um/Kconfig_x86_64 2005-08-15 14:04:27.000000000 -0400
@@ -33,3 +33,7 @@
config ARCH_REUSE_HOST_VSYSCALL_AREA
bool
default n
+
+config SMP_BROKEN
+ bool
+ default y
-
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