[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 b8c0702777ff4e1bb2557567a7aa7f6d987bb6eb..265f7a830619ef1e5de60bfe1179fa9d3a002229 100644 (file)
--- 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