[PATCH 2/2] drm/amdkfd: drop struct kfd_cu_info

[Arnd Bergmann]

On Tue, Sep 26, 2023, at 20:47, Deucher, Alexander wrote:
>> From: Arnd Bergmann <arnd at kernel.org>
>> Subject: Re: [PATCH 2/2] drm/amdkfd: drop struct kfd_cu_info
>>
>> On Tue, Sep 26, 2023, at 18:39, Alex Deucher wrote:
>> > I think this was an abstraction back from when kfd supported both
>> > radeon and amdgpu.  Since we just support amdgpu now, there is no more
>> > need for this and we can use the amdgpu structures directly.
>> >
>> > This also avoids having the kfd_cu_info structures on the stack when
>> > inlining which can blow up the stack.
>> >
>> > Cc: Arnd Bergmann <arnd at kernel.org>
>> > Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>>
>> Nice cleanup!
>>
>> Acked-by: Arnd Bergmann <arnd at arndb.de>
>>
>> I guess you could fold patch 1/2 into this as it removes all the added code from
>> that anyway.
>
> I left it as a separate patch as I didn't get a chance to see when the 
> stack warning appeared and figured it might be a good way to mitigate 
> that on stable kernels if necessary without pulling in the whole 
> rework, but if not, I can just squash it into the second patch.

Makes sense. FWIW, I had never seen the warning before updating
to linux-next this week from an older snapshot from last month.

My guess is that one of the recent changes made gcc take
different inlining decisions so we end up with two copies
of the cu_info in the same stack frame, even though the
fundamental problem was there already.

    Arnd