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dma-buf/sync_file: document flags field

Documentation for it was missing.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20170731193655.6176-1-gustavo@padovan.org

+4
+4
include/linux/sync_file.h
··· 25 25 * @file: file representing this fence 26 26 * @sync_file_list: membership in global file list 27 27 * @wq: wait queue for fence signaling 28 + * @flags: flags for the sync_file 28 29 * @fence: fence with the fences in the sync_file 29 30 * @cb: fence callback information 31 + * 32 + * flags: 33 + * POLL_ENABLED: whether userspace is currently poll()'ing or not 30 34 */ 31 35 struct sync_file { 32 36 struct file *file;