b=16776

[fs/lustre-release.git] / lustre / include / liblustre.h

diff --git a/lustre/include/liblustre.h b/lustre/include/liblustre.h
index 38905dd..b62b08a 100644 (file)
--- a/lustre/include/liblustre.h
+++ b/lustre/include/liblustre.h
@@ -318,6 +318,43 @@ static inline int capable(int cap)
 #define might_sleep_if(c)
 #define smp_mb()
 
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static inline 
+int fls(int x)
+{
+       int r = 32;
+
+       if (!x)
+               return 0;
+       if (!(x & 0xffff0000u)) {
+               x <<= 16;
+               r -= 16;
+       }
+       if (!(x & 0xff000000u)) {
+               x <<= 8;
+               r -= 8;
+       }
+       if (!(x & 0xf0000000u)) {
+               x <<= 4;
+               r -= 4;
+       }
+       if (!(x & 0xc0000000u)) {
+               x <<= 2;
+               r -= 2;
+       }
+       if (!(x & 0x80000000u)) {
+               x <<= 1;
+               r -= 1;
+       }
+       return r;
+}
+
 static inline
 int test_and_set_bit(int nr, unsigned long *addr)
 {