Re: [RFC][PATCH v6 3/7] drm: ttm_pool: Rework ttm_pool_free_page to allow us to use it as a function pointer

[John Stultz]

On Fri, Feb 5, 2021 at 12:28 AM Christian König
<christian.koenig@xxxxxxx> wrote:
> Am 05.02.21 um 09:06 schrieb John Stultz:
> > This refactors ttm_pool_free_page(), and by adding extra entries
> > to ttm_pool_page_dat, we then use it for all allocations, which
> > allows us to simplify the arguments needed to be passed to
> > ttm_pool_free_page().
>
> This is a clear NAK since the peer page data is just a workaround for
> the DMA-API hack to grab pages from there.
>
> Adding this to all pages would increase the memory footprint drastically.

Yea, that's a good point!  Hrm... bummer. I'll have to see if there's
some other way I can get the needed context for the free from the
generic page-pool side.

Thanks so much for the review!
-john