[FLS64]: x86_64 version

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/asm-x86_64/bitops.h b/include/asm-x86_64/bitops.h
index 94b52c8ce97f22d21bfd4a26ae7b34766c9f74be..a4d5d090945347fd89d70a2c2555bdb7112c7e06 100644 (file)
--- a/include/asm-x86_64/bitops.h
+++ b/include/asm-x86_64/bitops.h
@@ -340,6 +340,20 @@ static __inline__ unsigned long __ffs(unsigned long word)
        return word;
 }
 
+/*
+ * __fls: find last bit set.
+ * @word: The word to search
+ *
+ * Undefined if no zero exists, so code should check against ~0UL first.
+ */
+static __inline__ unsigned long __fls(unsigned long word)
+{
+       __asm__("bsrq %1,%0"
+               :"=r" (word)
+               :"rm" (word));
+       return word;
+}
+
 #ifdef __KERNEL__
 
 static inline int sched_find_first_bit(const unsigned long *b)
@@ -369,6 +383,19 @@ static __inline__ int ffs(int x)
        return r+1;
 }
 
+/**
+ * fls64 - find last bit set in 64 bit word
+ * @x: the word to search
+ *
+ * This is defined the same way as fls.
+ */
+static __inline__ int fls64(__u64 x)
+{
+       if (x == 0)
+               return 0;
+       return __fls(x) + 1;
+}
+
 /**
  * hweightN - returns the hamming weight of a N-bit word
  * @x: the word to weigh
@@ -409,7 +436,6 @@ static __inline__ int ffs(int x)
 
 /* find last set bit */
 #define fls(x) generic_fls(x)
-#define fls64(x) generic_fls64(x)
 
 #endif /* __KERNEL__ */