Commit:     5f81941c9d47f783e834028dcfb8548809da5a53
Parent:     6197fe4d720ea3e2ee94cdc7ef32d6c0151199de
Author:     Martin Habets <[EMAIL PROTECTED]>
AuthorDate: Tue May 29 01:11:57 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Tue May 29 02:51:24 2007 -0700

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
 arch/sparc/Kconfig       |    7 +++++++
 drivers/char/drm/Kconfig |    2 +-
 2 files changed, 8 insertions(+), 1 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
        default n
+       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
        default y
diff --git a/drivers/char/drm/Kconfig b/drivers/char/drm/Kconfig
index ef833a1..0b7ffa5 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 
-       depends on (AGP || AGP=n) && PCI
+       depends on (AGP || AGP=n) && PCI && !EMULATED_CMPXCHG
          Kernel-level support for the Direct Rendering Infrastructure (DRI)
          introduced in XFree86 4.0. If you say Y here, you need to select
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