[POWERPC] IOMMU virtual merge is no longer experimental

Per conversations with BenH, IOMMU virtual merging should no longer
be considered to be an "experimental" feature.  In particular,
CONFIG_VMERGE has been set to "y" in the defconfigs for quite a while.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
----
 arch/powerpc/Kconfig |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 00099efe0e9f8e79c21d6eec9aae86858e6fb080..66a329534b5e0d9025250599812f982dbcb9f8b5 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -181,16 +181,17 @@ config MATH_EMULATION
          instructions to run.
 
 config IOMMU_VMERGE
-       bool "Enable IOMMU virtual merging (EXPERIMENTAL)"
-       depends on EXPERIMENTAL && PPC64
-       default n
+       bool "Enable IOMMU virtual merging"
+       depends on PPC64
+       default y
        help
          Cause IO segments sent to a device for DMA to be merged virtually
          by the IOMMU when they happen to have been allocated contiguously.
          This doesn't add pressure to the IOMMU allocator. However, some
          drivers don't support getting large merged segments coming back
-         from *_map_sg(). Say Y if you know the drivers you are using are
-         properly handling this case.
+         from *_map_sg().
+
+         Most drivers don't have this problem; it is safe to say Y here.
 
 config HOTPLUG_CPU
        bool "Support for enabling/disabling CPUs"