From: Milton Miller <miltonm@bga.com>
Date: Tue, 25 Jul 2006 13:04:13 +0000 (+0200)
Subject: [PATCH] blktrace: fix read-ahead bit
X-Git-Tag: v2.6.18-rc3~33
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad01b1ca797e5898cd40bb32cf0dc8c85aa9f7e8;p=linux-2.6

[PATCH] blktrace: fix read-ahead bit

It should be toggling the same bit on and off, fix it up.

Signed-off-by: Jens Axboe <axboe@suse.de>
---

diff --git a/block/blktrace.c b/block/blktrace.c
index b8c0702777..265f7a8306 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -80,7 +80,7 @@ static u32 bio_act[5] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_AC
 #define trace_sync_bit(rw)	\
 	(((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1))
 #define trace_ahead_bit(rw)	\
-	(((rw) & (1 << BIO_RW_AHEAD)) << (BIO_RW_AHEAD - 0))
+	(((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD))
 
 /*
  * The worker for the various blk_add_trace*() types. Fills out a