1 files changed, 31 insertions, 0 deletions
diff --git a/modules/spl/spl-generic.c b/modules/spl/spl-generic.c
index 60bebfdc4..1f982f8bd 100644
--- a/modules/spl/spl-generic.c
+++ b/modules/spl/spl-generic.c
@@ -8,6 +8,37 @@
 int p0 = 0;
 EXPORT_SYMBOL(p0);
 
+int
+highbit(unsigned long i)
+{
+        register int h = 1;
+
+        if (i == 0)
+                return (0);
+#if BITS_PER_LONG == 64
+        if (i & 0xffffffff00000000ul) {
+                h += 32; i >>= 32;
+        }
+#endif
+        if (i & 0xffff0000) {
+                h += 16; i >>= 16;
+        }
+        if (i & 0xff00) {
+                h += 8; i >>= 8;
+        }
+        if (i & 0xf0) {
+                h += 4; i >>= 4;
+        }
+        if (i & 0xc) {
+                h += 2; i >>= 2;
+        }
+        if (i & 0x2) {
+                h += 1;
+        }
+        return (h);
+}
+EXPORT_SYMBOL(highbit);
+
 static int __init spl_init(void)
 {
         printk(KERN_INFO "spl: Loaded Solaris Porting Layer v%s\n", VERSION);