commit de23be5f3580f7b9b52cad6633bb3a3cd13abafe
Author: Stephen Rothwell <sfr@canb.auug.org.au>
Date:   Sat Jan 15 10:36:26 2011 +1100

    xen: export arbitrary_virt_to_machine
    
    Fixes this build error:
    
     ERROR: "arbitrary_virt_to_machine" [drivers/xen/xen-gntdev.ko] undefined!
    
    Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 7575e55..5e92b61 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -201,6 +201,7 @@ xmaddr_t arbitrary_virt_to_machine(void *vaddr)
 	offset = address & ~PAGE_MASK;
 	return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
 }
+EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
 
 void make_lowmem_page_readonly(void *vaddr)
 {