linux-kernel - Re: [PATCH] drm/amd/display: Slightly optimize dm_dmub_outbox1_low

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Date:   Wed, 22 Mar 2023 11:15:47 -0400
From:   Hamza Mahfooz <hamza.mahfooz@....com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        harry.wentland@....com, sunpeng.li@....com,
        Rodrigo.Siqueira@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, aurabindo.pillai@....com, roman.li@....com,
        hersenxs.wu@....com, stylon.wang@....com
Cc:     kernel-janitors@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Slightly optimize
 dm_dmub_outbox1_low_irq()

On 3/21/23 13:58, Christophe JAILLET wrote:
> A kzalloc()+memcpy() can be optimized in a single kmemdup().
> This saves a few cycles because some memory doesn't need to be zeroed.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Applied, thanks!

> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 5bac5781a06b..57a5fbdab890 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -820,15 +820,14 @@ static void dm_dmub_outbox1_low_irq(void *interrupt_params)
>   					DRM_ERROR("Failed to allocate dmub_hpd_wrk");
>   					return;
>   				}
> -				dmub_hpd_wrk->dmub_notify = kzalloc(sizeof(struct dmub_notification), GFP_ATOMIC);
> +				dmub_hpd_wrk->dmub_notify = kmemdup(&notify, sizeof(struct dmub_notification),
> +								    GFP_ATOMIC);
>   				if (!dmub_hpd_wrk->dmub_notify) {
>   					kfree(dmub_hpd_wrk);
>   					DRM_ERROR("Failed to allocate dmub_hpd_wrk->dmub_notify");
>   					return;
>   				}
>   				INIT_WORK(&dmub_hpd_wrk->handle_hpd_work, dm_handle_hpd_work);
> -				if (dmub_hpd_wrk->dmub_notify)
> -					memcpy(dmub_hpd_wrk->dmub_notify, &notify, sizeof(struct dmub_notification));
>   				dmub_hpd_wrk->adev = adev;
>   				if (notify.type == DMUB_NOTIFICATION_HPD) {
>   					plink = adev->dm.dc->links[notify.link_index];

-- 
Hamza