X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Finclude%2Fliblustre.h;h=b62b08a7674a76b923438cf77ef3d383f095c463;hp=38905dd29921da13cf23d919cb0b3e3880eee99f;hb=1a24137e8f26eaae9a2dac39a1e8a8a0bed46b6b;hpb=c7342f2d57745fe020d87012be52354d48a1bf7e;ds=sidebyside

diff --git a/lustre/include/liblustre.h b/lustre/include/liblustre.h
index 38905dd..b62b08a 100644
--- 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)
 {