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authorMartin Habets <errandir_news@mph.eclipse.co.uk>2007-05-29 01:11:57 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-05-29 02:51:24 -0700
commit5f81941c9d47f783e834028dcfb8548809da5a53 (patch)
tree8d528138012db5f8436a6822c79aea82977a8e90 /arch/sparc/Kconfig
parent6197fe4d720ea3e2ee94cdc7ef32d6c0151199de (diff)
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op-kernel-dev-5f81941c9d47f783e834028dcfb8548809da5a53.tar.gz
[SPARC]: Mark as emulating cmpxchg, add appropriate depends for DRM.
The DRM code depends on an atomic version of cmpxchg(), which is not available on sparc32. Since other platforms besides sparc32 have this issue a KCONFIG option is added for it. Signed-off-by: Martin Habets <errandir_news@mph.eclipse.co.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/Kconfig')
-rw-r--r--arch/sparc/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index bd992c0..fbcc00c 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -178,6 +178,13 @@ config ARCH_HAS_ILOG2_U64
bool
default n
+config EMULATED_CMPXCHG
+ bool
+ default y
+ help
+ Sparc32 does not have a CAS instruction like sparc64. cmpxchg()
+ is emulated, and therefore it is not completely atomic.
+
config SUN_PM
bool
default y
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