From 02edeb586ae4cdd17778923674700edb732a4741 Mon Sep 17 00:00:00 2001 From: Jeff Dike <jdike@addtoit.com> Date: Sat, 3 Sep 2005 15:57:33 -0700 Subject: [PATCH] [PATCH] uml: mark SMP on UML/x86_64 as broken Noticed by Al Viro <viro@parcelfarce.linux.theplanet.co.uk> - 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> Cc: Paolo Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> --- arch/um/Kconfig | 2 +- arch/um/Kconfig.x86_64 | 4 ++++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/um/Kconfig b/arch/um/Kconfig index d5e22f08488..684e1f8b275 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -196,7 +196,7 @@ config HOST_2G_2G 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. diff --git a/arch/um/Kconfig.x86_64 b/arch/um/Kconfig.x86_64 index 6e5357c5bcf..bd35e59419c 100644 --- a/arch/um/Kconfig.x86_64 +++ b/arch/um/Kconfig.x86_64 @@ -37,3 +37,7 @@ config ARCH_HAS_SC_SIGNALS config ARCH_REUSE_HOST_VSYSCALL_AREA bool default n + +config SMP_BROKEN + bool + default y -- 2.41.3