From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 2 Jun 2008 07:41:29 +0000 (+0200)
Subject: Fix off-by-one in generic ffz
X-Git-Tag: fio-1.21-rc4~8
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=6839616ff2ac013c8b0fbeb2a97f6cf20976b9f3

Fix off-by-one in generic ffz

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/lib/ffz.h b/lib/ffz.h
index 7fc7d456..4324f5a3 100644
--- a/lib/ffz.h
+++ b/lib/ffz.h
@@ -3,7 +3,7 @@
 
 static inline int __ffs(int word)
 {
-	int r = 0;
+	int r = 1;
 
 	if (!(word & 0xffff)) {
 		word >>= 16;
@@ -31,7 +31,7 @@ static inline int __ffs(int word)
 
 static inline int ffz(unsigned int bitmask)
 {
-	return ffs(~bitmask);
+	return ffs(~bitmask) - 1;
 }
 
 #endif