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authorLinas Vepstas <linas@austin.ibm.com>2007-07-18 02:09:35 +1000
committerPaul Mackerras <paulus@samba.org>2007-09-14 01:33:19 +1000
commit768cc2d3b2768ca34f254e8190f1f9e297b09ad4 (patch)
tree36a6d158b0dcca31991c5491cae613eafa7ae143 /arch/powerpc
parentb2315372eac9cd9f622c32a93e323cf6f0f03462 (diff)
[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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/Kconfig11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 00099efe0e9..66a329534b5 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"