[Nouveau] Is Nouveau really using the io_reserve_lru?

[Ben Skeggs]

On Tue, 24 Sep 2019 at 22:19, Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
>
> Hi guys,
>
> while working through more old TTM functionality I stumbled over the
> io_reserve_lru.
>
> Basic idea is that when this flag is set the driver->io_mem_reserve()
> callback can return -EAGAIN resulting in unmapping of other BOs.
>
> But Nouveau doesn't seem to return -EAGAIN in the call path of
> io_mem_reserve anywhere.
I believe this is a bug in Nouveau.  We *should* be returning -EAGAIN
if we fail to find space in BAR1 to map the BO into.

Ben.
>
> So is this unused or am I missing something?
>
> Regards,
> Christian.
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