linux-kernel - Re: drm/nouneau: 5.11 cycle regression bisected to 461619f5c324 "drm/nouveau: switch to new allocator"

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Message-ID: <5df26bda-9ff8-168f-e5a3-0bb503ffcca9@amd.com>
Date:   Wed, 10 Feb 2021 12:44:59 +0100
From:   Christian König <christian.koenig@....com>
To:     Mike Galbraith <efault@....de>, lkml <linux-kernel@...r.kernel.org>
Cc:     nouveau@...ts.freedesktop.org, Ben Skeggs <bskeggs@...hat.com>,
        Dave Airlie <airlied@...hat.com>
Subject: Re: drm/nouneau: 5.11 cycle regression bisected to 461619f5c324
 "drm/nouveau: switch to new allocator"

Please try to add a "return NULL" at the beginning of ttm_pool_type_take().

That should effectively disable using the pool.

Thanks for testing,
Christian.

Am 10.02.21 um 12:22 schrieb Mike Galbraith:
> On Wed, 2021-02-10 at 11:52 +0100, Christian König wrote:
>>
>> You could try to replace the "for (order = min(MAX_ORDER - 1UL,
>> __fls(num_pages)); num_pages;" in ttm_pool_alloc() with "for (order = 0;
>> num_pages;" to get the old behavior.
> That's a nogo too.
>
> 	-Mike
>