From: Christoph Hellwig <hch@xxxxxxxxxxxxx> The swap code already uses synchronous discards, no need to add I/O barriers. tj: superflous newlines removed. Signed-off-by: Christoph Hellwig <hch@xxxxxx> Acked-by: Hugh Dickins <hughd@xxxxxxxxxx> Tested-by: Nigel Cunningham <nigel@xxxxxxxxxxxx> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> --- mm/swapfile.c | 9 +++------ 1 files changed, 3 insertions(+), 6 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 1f3f9c5..68cda16 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -141,8 +141,7 @@ static int discard_swap(struct swap_info_struct *si) nr_blocks = ((sector_t)se->nr_pages - 1) << (PAGE_SHIFT - 9); if (nr_blocks) { err = blkdev_issue_discard(si->bdev, start_block, - nr_blocks, GFP_KERNEL, - BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); + nr_blocks, GFP_KERNEL, BLKDEV_IFL_WAIT); if (err) return err; cond_resched(); @@ -153,8 +152,7 @@ static int discard_swap(struct swap_info_struct *si) nr_blocks = (sector_t)se->nr_pages << (PAGE_SHIFT - 9); err = blkdev_issue_discard(si->bdev, start_block, - nr_blocks, GFP_KERNEL, - BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); + nr_blocks, GFP_KERNEL, BLKDEV_IFL_WAIT); if (err) break; @@ -193,8 +191,7 @@ static void discard_swap_cluster(struct swap_info_struct *si, start_block <<= PAGE_SHIFT - 9; nr_blocks <<= PAGE_SHIFT - 9; if (blkdev_issue_discard(si->bdev, start_block, - nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT | - BLKDEV_IFL_BARRIER)) + nr_blocks, GFP_NOIO, BLKDEV_IFL_WAIT)) break; } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html