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-rw-r--r--block/blktrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blktrace.c b/block/blktrace.c
index b8c07027..265f7a8 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
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