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-rw-r--r--mm/page_io.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/mm/page_io.c b/mm/page_io.c
index 2e8019d0e048..a39aac2f8c8d 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -29,10 +29,9 @@
static struct bio *get_swap_bio(gfp_t gfp_flags,
struct page *page, bio_end_io_t end_io)
{
- int i, nr = hpage_nr_pages(page);
struct bio *bio;
- bio = bio_alloc(gfp_flags, nr);
+ bio = bio_alloc(gfp_flags, 1);
if (bio) {
struct block_device *bdev;
@@ -41,9 +40,7 @@ static struct bio *get_swap_bio(gfp_t gfp_flags,
bio->bi_iter.bi_sector <<= PAGE_SHIFT - 9;
bio->bi_end_io = end_io;
- for (i = 0; i < nr; i++)
- bio_add_page(bio, page + i, PAGE_SIZE, 0);
- VM_BUG_ON(bio->bi_iter.bi_size != PAGE_SIZE * nr);
+ bio_add_page(bio, page, PAGE_SIZE * hpage_nr_pages(page), 0);
}
return bio;
}
@@ -140,8 +137,10 @@ out:
unlock_page(page);
WRITE_ONCE(bio->bi_private, NULL);
bio_put(bio);
- blk_wake_io_task(waiter);
- put_task_struct(waiter);
+ if (waiter) {
+ blk_wake_io_task(waiter);
+ put_task_struct(waiter);
+ }
}
int generic_swapfile_activate(struct swap_info_struct *sis,
@@ -398,11 +397,12 @@ int swap_readpage(struct page *page, bool synchronous)
* Keep this task valid during swap readpage because the oom killer may
* attempt to access it in the page fault retry time check.
*/
- get_task_struct(current);
- bio->bi_private = current;
bio_set_op_attrs(bio, REQ_OP_READ, 0);
- if (synchronous)
+ if (synchronous) {
bio->bi_opf |= REQ_HIPRI;
+ get_task_struct(current);
+ bio->bi_private = current;
+ }
count_vm_event(PSWPIN);
bio_get(bio);
qc = submit_bio(bio);