Re: [PATCH] drm/amd/display: Slightly optimize dm_dmub_outbox1_low_irq()

[Hamza Mahfooz]

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@xxxxxxxxxx>

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