[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>
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 @@
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