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[SPARC]: Mark as emulating cmpxchg, add appropriate depends for DRM.

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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>
This commit is contained in:
Martin Habets
2007-05-29 01:11:57 -07:00
committed by David S. Miller
parent 6197fe4d72
commit 5f81941c9d
2 changed files with 8 additions and 1 deletions
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7
arch/sparc/Kconfig
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@ -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