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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
parent6197fe4d720ea3e2ee94cdc7ef32d6c0151199de (diff)
[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>
-rw-r--r--arch/sparc/Kconfig7
-rw-r--r--drivers/char/drm/Kconfig2
2 files changed, 8 insertions, 1 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index bd992c0048f0..fbcc00c6c06e 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
diff --git a/drivers/char/drm/Kconfig b/drivers/char/drm/Kconfig
index ef833a1c27eb..0b7ffa5191c6 100644
--- a/drivers/char/drm/Kconfig
+++ b/drivers/char/drm/Kconfig
@@ -6,7 +6,7 @@
#
config DRM
tristate "Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)"
- depends on (AGP || AGP=n) && PCI
+ depends on (AGP || AGP=n) && PCI && !EMULATED_CMPXCHG
help
Kernel-level support for the Direct Rendering Infrastructure (DRI)
introduced in XFree86 4.0. If you say Y here, you need to select