[PATCH 10/18] dm-writecache: use bvec_kmap_local instead of bvec_kmap_irq
From: Christoph Hellwig <hch@lst.de>
Date: 2021-06-15 13:30:49
Also in:
ceph-devel, dm-devel, linux-arch, linux-block, linuxppc-dev, lkml
Subsystem:
device-mapper (lvm), the rest · Maintainers:
Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Linus Torvalds
There is no need to disable interrupts in bio_copy_block, and the local only mappings helps to avoid any sort of problems with stray writes into the bio data. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ira Weiny <ira.weiny@intel.com> --- drivers/md/dm-writecache.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index aecc246ade26..93ca454eaca9 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c@@ -1205,14 +1205,13 @@ static void memcpy_flushcache_optimized(void *dest, void *source, size_t size) static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data) { void *buf; - unsigned long flags; unsigned size; int rw = bio_data_dir(bio); unsigned remaining_size = wc->block_size; do { struct bio_vec bv = bio_iter_iovec(bio, bio->bi_iter); - buf = bvec_kmap_irq(&bv, &flags); + buf = bvec_kmap_local(&bv); size = bv.bv_len; if (unlikely(size > remaining_size)) size = remaining_size;
@@ -1230,7 +1229,7 @@ static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data memcpy_flushcache_optimized(data, buf, size); } - bvec_kunmap_irq(buf, &flags); + kunmap_local(buf); data = (char *)data + size; remaining_size -= size;
--
2.30.2