| From | Ming Lei <> | Subject | [PATCH v2 08/51] block: comment on bio_alloc_pages() | Date | Mon, 26 Jun 2017 20:09:51 +0800 |
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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(-)
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. -- 2.9.4
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