block: split bio if the only bvec's length is > SZ_4K

64K PAGE_SIZE is popular on ARM64 or other ARCHs, and 64K has been big enough to break some devices probably, so change the logic to split bio if the only bvec's length is > SZ_4K instead of PAGE_SIZE. Fixes: fa53228 (block: avoid blk_bio_segment_split for small I/O operations) Cc: Christoph Hellwig <[email protected]> Signed-off-by: Ming Lei <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
jbg · Nov 8, 2019 · 6952a7f · 6952a7f
1 parent 59db8ba
commit 6952a7f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/block/blk-merge.c b/block/blk-merge.c
@@ -320,7 +320,7 @@ void __blk_queue_split(struct request_queue *q, struct bio **bio,
 		if (!q->limits.chunk_sectors &&
 		    (*bio)->bi_vcnt == 1 &&
 		    ((*bio)->bi_io_vec[0].bv_len +
-		     (*bio)->bi_io_vec[0].bv_offset) <= PAGE_SIZE) {
+		     (*bio)->bi_io_vec[0].bv_offset) <= SZ_4K) {
 			*nr_segs = 1;
 			break;
 		}