[RFC PATCH 14/16] block: bio: go straight from pfn_t to phys instead of through page
From: Logan Gunthorpe <logang@deltatee.com>
Date: 2017-05-24 21:44:58
Also in:
linux-nvme, linux-rdma, lkml, nvdimm
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Going straight from pfn_t to physical address is cheaper and avoids the potential BUG_ON in bvec_page for unmappable memory. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Stephen Bates <redacted> --- include/linux/bio.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index bc5f5d3..890c94d 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h@@ -46,6 +46,8 @@ #define bio_iter_iovec(bio, iter) \ bvec_iter_bvec((bio)->bi_io_vec, (iter)) +#define bio_iter_pfn_t(bio, iter) \ + bvec_iter_pfn_t((bio)->bi_io_vec, (iter)) #define bio_iter_page(bio, iter) \ bvec_iter_page((bio)->bi_io_vec, (iter)) #define bio_iter_len(bio, iter) \
@@ -53,6 +55,7 @@ #define bio_iter_offset(bio, iter) \ bvec_iter_offset((bio)->bi_io_vec, (iter)) +#define bio_pfn_t(bio) bio_iter_pfn_t((bio), (bio)->bi_iter) #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter)
@@ -118,8 +121,8 @@ static inline void *bio_data(struct bio *bio) /* * will die */ -#define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) -#define bvec_to_phys(bv) (page_to_phys(bvec_page((bv))) + (unsigned long) (bv)->bv_offset) +#define bio_to_phys(bio) (pfn_t_to_phys(bio_pfn_t((bio))) + (unsigned long) bio_offset((bio))) +#define bvec_to_phys(bv) (pfn_t_to_phys((bv)->bv_pfn) + (unsigned long) (bv)->bv_offset) /* * queues that have highmem support enabled may still need to revert to
--
2.1.4