zero_pfn is not exported before 3.17.

Signed-off-by: Paolo Bonzini <[email protected]>
---
 external-module-compat-comm.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/external-module-compat-comm.h b/external-module-compat-comm.h
index dff603f..c20b1ed 100644
--- a/external-module-compat-comm.h
+++ b/external-module-compat-comm.h
@@ -1421,3 +1421,6 @@ extern u64 kvm_get_boot_base_ns(struct timekeeper *tk);
 #ifndef FOLL_TRIED
 #define FOLL_TRIED 0
 #endif
+
+#undef is_zero_pfn
+#define is_zero_pfn(pfn) ((pfn) == page_to_pfn(ZERO_PAGE(0)))
-- 
1.8.3.1

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