linux-kernel - Re: [PATCH v6 3/3] drm/virtio: Support sync objects

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Message-ID: <259ffa89-39d9-5c00-c70c-0cb26a6aab65@collabora.com>
Date:   Wed, 19 Jul 2023 21:58:28 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     David Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Marek Olšák <maraeo@...il.com>,
        Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
        Emil Velikov <emil.velikov@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v6 3/3] drm/virtio: Support sync objects

27.06.2023 15:01, Geert Uytterhoeven пишет:
> Hi Dmitry,
> 
> On Mon, Jun 26, 2023 at 6:11 PM Dmitry Osipenko
> <dmitry.osipenko@...labora.com> wrote:
>> On 6/25/23 18:36, Geert Uytterhoeven wrote:
>>> On Sun, Jun 25, 2023 at 2:41 PM Dmitry Osipenko
>>> <dmitry.osipenko@...labora.com> wrote:
>>>> On 6/25/23 11:47, Geert Uytterhoeven wrote:
>>>>> On Sun, Apr 16, 2023 at 1:55 PM Dmitry Osipenko
>>>>> <dmitry.osipenko@...labora.com> wrote:
>>>>>> Add sync object DRM UAPI support to VirtIO-GPU driver. Sync objects
>>>>>> support is needed by native context VirtIO-GPU Mesa drivers, it also will
>>>>>> be used by Venus and Virgl contexts.
>>>>>>
>>>>>> Reviewed-by; Emil Velikov <emil.velikov@...labora.com>
>>>>>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
>>>>>
>>>>> Thanks for your patch!
>>>>>
>>>>>> --- a/drivers/gpu/drm/virtio/virtgpu_submit.c
>>>>>> +++ b/drivers/gpu/drm/virtio/virtgpu_submit.c
>>>>>
>>>>>> +static int
>>>>>> +virtio_gpu_parse_deps(struct virtio_gpu_submit *submit)
>>>>>> +{
>>>>>> +       struct drm_virtgpu_execbuffer *exbuf = submit->exbuf;
>>>>>> +       struct drm_virtgpu_execbuffer_syncobj syncobj_desc;
>>>>>> +       size_t syncobj_stride = exbuf->syncobj_stride;
>>>>>> +       u32 num_in_syncobjs = exbuf->num_in_syncobjs;
>>>>>> +       struct drm_syncobj **syncobjs;
>>>>>> +       int ret = 0, i;
>>>>>> +
>>>>>> +       if (!num_in_syncobjs)
>>>>>> +               return 0;
>>>>>> +
>>>>>> +       /*
>>>>>> +        * kvalloc at first tries to allocate memory using kmalloc and
>>>>>> +        * falls back to vmalloc only on failure. It also uses GFP_NOWARN
>>>>>
>>>>> GFP_NOWARN does not exist.
>>>>
>>>> https://elixir.bootlin.com/linux/v6.4-rc7/source/include/linux/gfp_types.h#L38
>>>
>>> That line defines "__GFP_NOWARN", not "GFP_NOWARN".
>>> C is case- and underscore-sensitive. as is "git grep -w" ;-)
>>
>> The removal of underscores was done intentionally for improving
>> readability of the comment
> 
> Please don't do that, as IMHO it actually hampers readability:
>   1. For some xxx, both GFP_xxx and __GFP_xxx are defined,
>      so it does matter which one you are referring to,
>   2. After dropping the underscores, "git grep -w" can no longer find
>      the definition, nor its users.
> 
> Thanks!

Alright, I'll change it

-- 
Best regards,
Dmitry