X-Git-Url: https://git.karo-electronics.de/?p=mv-sheeva.git;a=blobdiff_plain;f=include%2Flinux%2Fbitops.h;fp=include%2Flinux%2Fbitops.h;h=2184c6b97aebb699206e2eb7426bd716b8f0e54f;hp=827cc95711ef82563e0f7a1718f364ce8adfd451;hb=92d62d098f574ed70b26548e6a2e2f67025864dc;hpb=690c12d2c8ca50e55a3f507059c780ecdb8fd83f

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 827cc95711e..2184c6b97ae 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -109,6 +109,17 @@ static inline __u8 ror8(__u8 word, unsigned int shift)
 	return (word >> shift) | (word << (8 - shift));
 }
 
+/**
+ * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
+ * @value: value to sign extend
+ * @index: 0 based bit index (0<=index<32) to sign bit
+ */
+static inline __s32 sign_extend32(__u32 value, int index)
+{
+	__u8 shift = 31 - index;
+	return (__s32)(value << shift) >> shift;
+}
+
 static inline unsigned fls_long(unsigned long l)
 {
 	if (sizeof(l) == 4)