The clang warning -Wshorten-64-to-32 can be useful to catch
inadvertent truncation. In some instances this truncation can lead to
changing the sign of a result, for example, truncation to return an
int to fit a sort routine. Silence the warning by making the implicit
truncation explicit.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 include/linux/math64.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/math64.h b/include/linux/math64.h
index 6aaccc1626ab..f32fcb2a2331 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -179,7 +179,7 @@ static __always_inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
 #ifndef mul_u64_u32_shr
 static __always_inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
 {
-	u32 ah = a >> 32, al = a;
+	u32 ah = a >> 32, al = (u32)a;
 	u64 ret;
 
 	ret = mul_u32_u32(al, mul) >> shift;
-- 
2.49.0.504.g3bcea36a83-goog