mm: Make generic weak get_user_pages_fast and EXPORT_GPL it

Out of line get_user_pages_fast fallback implementation, make it a weak
symbol, get rid of CONFIG_HAVE_GET_USER_PAGES_FAST.

Export the symbol to modules so lguest can use it.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

3 files changed, 1 insertions, 6 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 63c9cafda9c4..587da5e0990f 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -42,9 +42,6 @@ config GENERIC_HARDIRQS
         bool
         default y
 
-config HAVE_GET_USER_PAGES_FAST
-        def_bool PPC64
-
 config HAVE_SETUP_PER_CPU_AREA
         def_bool PPC64
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3d0f2b6a5a16..ac2fb0641a04 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -22,7 +22,6 @@ config X86
         select HAVE_IDE
         select HAVE_OPROFILE
         select HAVE_IOREMAP_PROT
-        select HAVE_GET_USER_PAGES_FAST
         select HAVE_KPROBES
         select ARCH_WANT_OPTIONAL_GPIOLIB
         select HAVE_KRETPROBES
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 2977ea37791f..dfb932dcf136 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -1,7 +1,6 @@
 obj-y   :=  init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \
-            pat.o pgtable.o
+            pat.o pgtable.o gup.o
 
-obj-$(CONFIG_HAVE_GET_USER_PAGES_FAST) += gup.o
 obj-$(CONFIG_X86_32)            += pgtable_32.o
 
 obj-$(CONFIG_HUGETLB_PAGE)      += hugetlbpage.o