[PATCH v3] drm: add a check to verify the size alignment

[Matthew Auld]

On 11/04/2022 13:42, Christian König wrote:
> 
> Am 11.04.22 um 11:47 schrieb Matthew Auld:
>> On 11/04/2022 08:38, Arunpravin Paneer Selvam wrote:
>>> Add a simple check to reject any size not aligned to the
>>> min_page_size.
>>>
>>> when size is not aligned to min_page_size, driver module
>>> should handle in their own way either to round_up() the
>>> size value to min_page_size or just to enable WARN_ON().
>>>
>>> If we dont handle the alignment properly, we may hit the
>>> following bug, Unigine Heaven has allocation requests for
>>> example required pages are 257 and alignment request is 256.
>>> To allocate the left over 1 page, continues the iteration to
>>> find the order value which is 0 and when it compares with
>>> min_order = 8, triggers the BUG_ON(order < min_order).
>>>
>>> v2: add more commit description
>>> v3: remove WARN_ON()
>>>
>>> Signed-off-by: Arunpravin Paneer Selvam 
>>> <Arunpravin.PaneerSelvam at amd.com>
>>> Suggested-by: Matthew Auld <matthew.auld at intel.com>
>> Reviewed-by: Matthew Auld <matthew.auld at intel.com>
>>
> 
> Question here is who will be pushing that to drm-misc-next? Should I 
> take care of that?

Yes, please do.

> 
> I think it's time that Arun should request push permission for 
> drm-misc-next.
> 
> Thanks,
> Christian.