[PATCH RFC PKS/PMEM 48/58] drivers/md: Utilize new kmap_thread()

[ira.weiny@xxxxxxxxx]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

These kmap() calls are localized to a single thread.  To avoid the over
head of global PKRS updates use the new kmap_thread() call.

Cc: Coly Li <colyli@xxxxxxx> (maintainer:BCACHE (BLOCK LAYER CACHE))
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx> (maintainer:BCACHE (BLOCK LAYER 
CACHE))
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 drivers/md/bcache/request.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index c7cadaafa947..a4571f6d09dd 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -44,10 +44,10 @@ static void bio_csum(struct bio *bio, struct bkey *k)
        uint64_t csum = 0;
 
        bio_for_each_segment(bv, bio, iter) {
-               void *d = kmap(bv.bv_page) + bv.bv_offset;
+               void *d = kmap_thread(bv.bv_page) + bv.bv_offset;
 
                csum = bch_crc64_update(csum, d, bv.bv_len);
-               kunmap(bv.bv_page);
+               kunmap_thread(bv.bv_page);
        }
 
        k->ptr[KEY_PTRS(k)] = csum & (~0ULL >> 1);
-- 
2.28.0.rc0.12.gb6a658bd00c9