From: Ira Weiny ira.weiny@intel.com
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@suse.de (maintainer:BCACHE (BLOCK LAYER CACHE)) Cc: Kent Overstreet kent.overstreet@gmail.com (maintainer:BCACHE (BLOCK LAYER CACHE)) Signed-off-by: Ira Weiny ira.weiny@intel.com --- 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);