xen/p2m: Fix module linking error.

Fixes:
ERROR: "m2p_find_override_pfn" [drivers/block/xen-blkfront.ko] undefined!

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 40d51225ff084ac95e2c166b32c329784f13d272..8f2251d2a3f805b1f0128782e74260d7a3082545 100644 (file)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -507,3 +507,4 @@ unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn)
 
        return ret;
 }
+EXPORT_SYMBOL_GPL(m2p_find_override_pfn);