[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>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 00099efe0e9f..66a329534b5e 100644
--- 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"