Re: [PATCH 0/9 v5] Helper to abstract vma handling in media layer

[Hans Verkuil <hverkuil@xs4all.nl>]

Hi Jan,

On 05/13/2015 03:08 PM, Jan Kara wrote:
>   Hello,
> 
> I'm sending the fifth version of my patch series to abstract vma handling
> from the various media drivers. The patches got some review from mm people and
> testing from device driver guys so unless someone objects, patches will be
> queued in media tree for the next merge window.

What is the current status? I saw one comment for patch 9, so I assume it is not
quite ready yet.

Let me know when you think it is time to merge.

Regards,

	Hans

> 
> After this patch set drivers have to know much less details about vmas, their
> types, and locking. Also quite some code is removed from them. As a bonus
> drivers get automatically VM_FAULT_RETRY handling. The primary motivation for
> this series is to remove knowledge about mmap_sem locking from as many places a
> possible so that we can change it with reasonable effort.
> 
> The core of the series is the new helper get_vaddr_frames() which is given a
> virtual address and it fills in PFNs / struct page pointers (depending on VMA
> type) into the provided array. If PFNs correspond to normal pages it also grabs
> references to these pages. The difference from get_user_pages() is that this
> function can also deal with pfnmap, and io mappings which is what the media
> drivers need.
> 
> I have tested the patches with vivid driver so at least vb2 code got some
> exposure. Conversion of other drivers was just compile-tested (for x86 so e.g.
> exynos driver which is only for Samsung platform is completely untested).
> 
> 								Honza
> Changes since v4:
> * Minor cleanups and fixes pointed out by Mel and Vlasta
> * Added Acked-by tags
> 
> Changes since v3:
> * Added include <linux/vmalloc.h> into mm/gup.c as it's needed for some archs
> * Fixed error path for exynos driver
> 
> Changes since v2:
> * Renamed functions and structures as Mel suggested
> * Other minor changes suggested by Mel
> * Rebased on top of 4.1-rc2
> * Changed functions to get pointer to array of pages / pfns to perform
>   conversion if necessary. This fixes possible issue in the omap I may have
>   introduced in v2 and generally makes the API less errorprone.
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