On Jul 30, 2008, at 5:26 PM, Benjamin Herrenschmidt wrote:
Index: linux-work/arch/powerpc/Kconfig
===================================================================
--- linux-work.orig/arch/powerpc/Kconfig 2008-07-30
13:17:06.000000000 +1000
+++ linux-work/arch/powerpc/Kconfig 2008-07-30 13:27:40.000000000
+1000
@@ -42,6 +42,9 @@ config GENERIC_HARDIRQS
bool
default y
+config HAVE_GET_USER_PAGES_FAST
+ def_bool PPC64
+
config HAVE_SETUP_PER_CPU_AREA
def_bool PPC64
what's ppc64 specific here?
Mostly _PAGE_SPECIAL (which I do plan to add to embedded which is why
I've been trying hard to free a PTE bit :-) and the way we synchronize
with the freeing of page tables (ppc64 uses RCU, ppc32 doesn't, we'd
have to find something to keep fast gup in sync).
I think we have some code that uses RCU for page freeing. I'll dig it
up and posted it.
- k
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