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[PATCH] uml: mark SMP on UML/x86_64 as broken

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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>
This commit is contained in:
Jeff Dike 2005-09-03 15:57:33 -07:00 committed by Linus Torvalds
parent 13abf81301
commit 02edeb586a
2 changed files with 5 additions and 1 deletions
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2
arch/um/Kconfig
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@ -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.

4
arch/um/Kconfig.x86_64
View File

@ -37,3 +37,7 @@ config ARCH_HAS_SC_SIGNALS
config ARCH_REUSE_HOST_VSYSCALL_AREA
bool
default n
config SMP_BROKEN
bool
default y