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[v2,08/51] block: comment on bio_alloc_pages()

Message ID 20170626121034.3051-9-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei June 26, 2017, 12:09 p.m. UTC 
This patch adds comment on usage of bio_alloc_pages().

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 block/bio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/block/bio.c b/block/bio.c
index 89a51bd49ab7..a5db117e8dfa 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -972,7 +972,9 @@  EXPORT_SYMBOL(bio_advance);
  * @bio: bio to allocate pages for
  * @gfp_mask: flags for allocation
  *
- * Allocates pages up to @bio->bi_vcnt.
+ * Allocates pages up to @bio->bi_vcnt, and this function should only
+ * be called on a new initialized bio, which means all pages aren't added
+ * to the bio via bio_add_page() yet.
  *
  * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
  * freed.