On Tue, Feb 22, 2022 at 04:51:52PM +0100, Christoph Hellwig wrote: > Using local kmaps slightly reduces the chances to stray writes, and > the bvec interface cleans up the code a little bit. > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > --- > drivers/nvdimm/btt.c | 10 ++++------ > 1 file changed, 4 insertions(+), 6 deletions(-) > > diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c > index cbd994f7f1fe6..9613e54c7a675 100644 > --- a/drivers/nvdimm/btt.c > +++ b/drivers/nvdimm/btt.c > @@ -1163,17 +1163,15 @@ static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, > */ > > cur_len = min(len, bv.bv_len); > - mem = kmap_atomic(bv.bv_page); > + mem = bvec_kmap_local(&bv); > if (rw) > - ret = arena_write_bytes(arena, meta_nsoff, > - mem + bv.bv_offset, cur_len, > + ret = arena_write_bytes(arena, meta_nsoff, mem, cur_len, Why drop bv.bv_offset here and below? Ira > NVDIMM_IO_ATOMIC); > else > - ret = arena_read_bytes(arena, meta_nsoff, > - mem + bv.bv_offset, cur_len, > + ret = arena_read_bytes(arena, meta_nsoff, mem, cur_len, > NVDIMM_IO_ATOMIC); > > - kunmap_atomic(mem); > + kunmap_local(mem); > if (ret) > return ret; > > -- > 2.30.2 > >
