On Wed, 2010-03-03 at 08:54 +0900, FUJITA Tomonori wrote: > Seems that IOMMU_VMERGE option description gives the false > information: > > http://marc.info/?l=linux-sparc&m=126753808727669&w=2 > http://marc.info/?l=linux-sparc&m=126753880528825&w=2 > > IOMMU_VMERGE is unnecessary nowadays so how about removing it?
Except you didn't remove it, you just made it uneditable? Why not get rid of it entirely. cheers > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 155d571..2dfa83b 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -314,17 +314,8 @@ config 8XX_MINIMAL_FPEMU > It is recommended that you build a soft-float userspace instead. > > config IOMMU_VMERGE > - bool "Enable IOMMU virtual merging" > + def_bool y > 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(). > - > - Most drivers don't have this problem; it is safe to say Y here. > > config IOMMU_HELPER > def_bool PPC64
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