linux-kernel - Re: [PATCH v18 11/26] drm/shmem-helper: Prepare drm_gem_shmem

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Date:   Mon, 20 Nov 2023 14:38:00 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     David Airlie <airlied@...il.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Emma Anholt <emma@...olt.net>, Melissa Wen <mwen@...lia.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v18 11/26] drm/shmem-helper: Prepare drm_gem_shmem_free()
 to shrinker addition

On 11/20/23 14:19, Boris Brezillon wrote:
...
>>>> -		dma_resv_lock(shmem->base.resv, NULL);
>>>> -
>>>>  		drm_WARN_ON(obj->dev, refcount_read(&shmem->vmap_use_count));
>>>>  
>>>>  		if (shmem->sgt) {
>>>> @@ -157,8 +171,6 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem)
>>>>    
>>> If you drop the dma_resv_lock/unlock(), you should also replace the
>>> drm_gem_shmem_put_pages_locked() by a drm_gem_shmem_free_pages() in this
>>> commit.  
>>
>> drm_gem_shmem_put_pages_locked() is exported by a later patch of this
>> series, it's not worthwhile to remove this function
> 
> I'm not talking about removing drm_gem_shmem_put_pages_locked(), but
> replacing the drm_gem_shmem_put_pages_locked() call you have in
> drm_gem_shmem_free() by a drm_gem_shmem_free_pages(), so you don't end
> up with a lockdep warning when you stop exactly here in the patch
> series, which is important if we want to keep things bisectable.

Indeed, there is assert_locked() there. Thanks for the clarification :)

-- 
Best regards,
Dmitry