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media: videobuf2-core.h: Document the alloc memop size argument as page aligned

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The size argument of the alloc memop, which allocates buffer memory, is
page aligned. Document it as such in the only caller as well as ops
documentation.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Sakari Ailus 2018-12-12 07:40:48 -05:00 committed by Mauro Carvalho Chehab
parent 14f28f5cea
commit b29ecab178
2 changed files with 3 additions and 1 deletions
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1
drivers/media/common/videobuf2/videobuf2-core.c
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@ -205,6 +205,7 @@ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
* NOTE: mmapped areas should be page aligned
*/
for (plane = 0; plane < vb->num_planes; ++plane) {
/* Memops alloc requires size to be page aligned. */
unsigned long size = PAGE_ALIGN(vb->planes[plane].length);
/* Did it wrap around? */

3
include/media/videobuf2-core.h
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@ -54,7 +54,8 @@ struct vb2_threadio_data;
* will then be passed as @buf_priv argument to other ops in this
* structure. Additional gfp_flags to use when allocating the
* are also passed to this operation. These flags are from the
* gfp_flags field of vb2_queue.
* gfp_flags field of vb2_queue. The size argument to this function
* shall be *page aligned*.
* @put: inform the allocator that the buffer will no longer be used;
* usually will result in the allocator freeing the buffer (if
* no other users of this buffer are present); the @buf_priv