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linux-next/Documentation/userspace-api
Sergey Senozhatsky 1e0b2318fa media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag
This patch lets user-space to request a non-consistent memory
allocation during CREATE_BUFS and REQBUFS ioctl calls.

= CREATE_BUFS

  struct v4l2_create_buffers has seven 4-byte reserved areas,
  so reserved[0] is renamed to ->flags. The struct, thus, now
  has six reserved 4-byte regions.

= CREATE_BUFS32

  struct v4l2_create_buffers32 has seven 4-byte reserved areas,
  so reserved[0] is renamed to ->flags. The struct, thus, now
  has six reserved 4-byte regions.

= REQBUFS

 We use one bit of a ->reserved[1] member of struct v4l2_requestbuffers,
 which is now renamed to ->flags. Unlike v4l2_create_buffers, struct
 v4l2_requestbuffers does not have enough reserved room. Therefore for
 backward compatibility  ->reserved and ->flags were put into anonymous
 union.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2020-06-23 13:32:41 +02:00
..
accelerators docs: ocxl.rst: add it to the uAPI book 2019-07-15 11:03:02 -03:00
ioctl Notifications over pipes + Keyring notifications 2020-06-13 09:56:21 -07:00
media media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag 2020-06-23 13:32:41 +02:00
index.rst media: docs: get rid of Documentation/media/ 2020-04-14 10:36:50 +02:00
no_new_privs.rst doc: ReSTify no_new_privs.txt 2017-05-18 10:30:09 -06:00
seccomp_filter.rst Documentation: seccomp: unify list indentation 2019-03-18 12:00:28 -06:00
spec_ctrl.rst Documentation: Add section about CPU vulnerabilities for Spectre 2019-06-26 11:42:41 -06:00
unshare.rst doc-rst: fix inline emphasis in unshare.rst 2017-05-18 10:23:10 -06:00