zram: use bvec_set_page to initialize bvecs

Use the bvec_set_page helper to initialize bvecs.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20230203150634.3199647-11-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/zram/zram_drv.c

@@ -703,9 +703,7 @@ static ssize_t writeback_store(struct device *dev,
 	for (; nr_pages != 0; index++, nr_pages--) {
 		struct bio_vec bvec;
 
-		bvec.bv_page = page;
-		bvec.bv_len = PAGE_SIZE;
-		bvec.bv_offset = 0;
+		bvec_set_page(&bvec, page, PAGE_SIZE, 0);
 
 		spin_lock(&zram->wb_limit_lock);
 		if (zram->wb_limit_enable && !zram->bd_wb_limit) {
@@ -1380,12 +1378,9 @@ static void zram_free_page(struct zram *zram, size_t index)
 static int zram_bvec_read_from_bdev(struct zram *zram, struct page *page,
 				    u32 index, struct bio *bio, bool partial_io)
 {
-	struct bio_vec bvec = {
-		.bv_page = page,
-		.bv_len = PAGE_SIZE,
-		.bv_offset = 0,
-	};
+	struct bio_vec bvec;
 
+	bvec_set_page(&bvec, page, PAGE_SIZE, 0);
 	return read_from_bdev(zram, &bvec, zram_get_element(zram, index), bio,
 			      partial_io);
 }
@@ -1652,9 +1647,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec,
 		memcpy_from_bvec(dst + offset, bvec);
 		kunmap_atomic(dst);
 
-		vec.bv_page = page;
-		vec.bv_len = PAGE_SIZE;
-		vec.bv_offset = 0;
+		bvec_set_page(&vec, page, PAGE_SIZE, 0);
 	}
 
 	ret = __zram_bvec_write(zram, &vec, index, bio);