From 75ad23bc0fcb4f992a5d06982bf0857ab1738e9e Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Tue, 29 Apr 2008 14:48:33 +0200 Subject: block: make queue flags non-atomic We can save some atomic ops in the IO path, if we clearly define the rules of how to modify the queue flags. Signed-off-by: Jens Axboe --- block/blk-merge.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'block/blk-merge.c') diff --git a/block/blk-merge.c b/block/blk-merge.c index b5c5c4a9e3f0..73b23562af20 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -55,7 +55,7 @@ void blk_recalc_rq_segments(struct request *rq) if (!rq->bio) return; - cluster = q->queue_flags & (1 << QUEUE_FLAG_CLUSTER); + cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); hw_seg_size = seg_size = 0; phys_size = hw_size = nr_phys_segs = nr_hw_segs = 0; rq_for_each_segment(bv, rq, iter) { @@ -128,7 +128,7 @@ EXPORT_SYMBOL(blk_recount_segments); static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio, struct bio *nxt) { - if (!(q->queue_flags & (1 << QUEUE_FLAG_CLUSTER))) + if (!test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags)) return 0; if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt))) @@ -175,7 +175,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq, int nsegs, cluster; nsegs = 0; - cluster = q->queue_flags & (1 << QUEUE_FLAG_CLUSTER); + cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags); /* * for each bio in rq -- cgit v1.2.3