[PATCH v4 01/11] math64.h: Add mul_s64_u64_shr()

[Ilias Stamatis <ilstam@amazon.com>]

This function is needed for KVM's nested virtualization. The nested TSC
scaling implementation requires multiplying the signed TSC offset with
the unsigned TSC multiplier.

Signed-off-by: Ilias Stamatis <ilstam@amazon.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 include/linux/math64.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/math64.h b/include/linux/math64.h
index 66deb1fdc2ef..2928f03d6d46 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -3,6 +3,7 @@
 #define _LINUX_MATH64_H
 
 #include <linux/types.h>
+#include <linux/math.h>
 #include <vdso/math64.h>
 #include <asm/div64.h>
 
@@ -234,6 +235,24 @@ static inline u64 mul_u64_u64_shr(u64 a, u64 b, unsigned int shift)
 
 #endif
 
+#ifndef mul_s64_u64_shr
+static inline u64 mul_s64_u64_shr(s64 a, u64 b, unsigned int shift)
+{
+	u64 ret;
+
+	/*
+	 * Extract the sign before the multiplication and put it back
+	 * afterwards if needed.
+	 */
+	ret = mul_u64_u64_shr(abs(a), b, shift);
+
+	if (a < 0)
+		ret = -((s64) ret);
+
+	return ret;
+}
+#endif /* mul_s64_u64_shr */
+
 #ifndef mul_u64_u32_div
 static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
 {
-- 
2.17.1