[PATCH 1/2] drm: mediatek: mtk_drm_plane: Use kmalloc in mtk_plane_duplicate_state

[PATCH 1/2] drm: mediatek: mtk_drm_plane: Use kmalloc in mtk_plane_duplicate_state

[AngeloGioacchino Del Regno]

There is no need to zero out the newly allocated memory because we are
duplicating all members of struct mtk_plane_state: switch to kmalloc
to save some overhead.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
index c74cb94e445e..39cb9a80d976 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -57,7 +57,7 @@ static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane
 	struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
 	struct mtk_plane_state *state;
 
-	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	state = kmalloc(sizeof(*state), GFP_KERNEL);
 	if (!state)
 		return NULL;
 
-- 
2.33.1


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[PATCH 2/2] drm: mediatek: mtk_drm_crtc: Use kmalloc in mtk_drm_crtc_duplicate_state

[AngeloGioacchino Del Regno]

Optimize mtk_drm_crtc_duplicate_state() by switching from kzalloc() to
kmalloc(): the only variable of this struct that gets checked in other
functions is `pending_config`, but if that's set to false, then all of
the remaining variables will only ever be set, but not read - so, also
set `pending_config` to false.
This saves us some small overhead.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 09fc9ad02c7a..f536a0a927e4 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -185,7 +185,7 @@ static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc
 {
 	struct mtk_crtc_state *state;
 
-	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	state = kmalloc(sizeof(*state), GFP_KERNEL);
 	if (!state)
 		return NULL;
 
@@ -193,6 +193,7 @@ static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc
 
 	WARN_ON(state->base.crtc != crtc);
 	state->base.crtc = crtc;
+	state->pending_config = false;
 
 	return &state->base;
 }
-- 
2.33.1


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Re: [PATCH 2/2] drm: mediatek: mtk_drm_crtc: Use kmalloc in mtk_drm_crtc_duplicate_state

[Chun-Kuang Hu]

Hi, AngeloGioacchino:

AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> 於
2022年1月18日 週二 下午9:41寫道：
>
> Optimize mtk_drm_crtc_duplicate_state() by switching from kzalloc() to
> kmalloc(): the only variable of this struct that gets checked in other
> functions is `pending_config`, but if that's set to false, then all of
> the remaining variables will only ever be set, but not read - so, also
> set `pending_config` to false.
> This saves us some small overhead.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 09fc9ad02c7a..f536a0a927e4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -185,7 +185,7 @@ static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc
>  {
>         struct mtk_crtc_state *state;
>
> -       state = kzalloc(sizeof(*state), GFP_KERNEL);
> +       state = kmalloc(sizeof(*state), GFP_KERNEL);
>         if (!state)
>                 return NULL;
>
> @@ -193,6 +193,7 @@ static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc
>
>         WARN_ON(state->base.crtc != crtc);
>         state->base.crtc = crtc;
> +       state->pending_config = false;
>
>         return &state->base;
>  }
> --
> 2.33.1
>

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Re: [PATCH 1/2] drm: mediatek: mtk_drm_plane: Use kmalloc in mtk_plane_duplicate_state

[Chun-Kuang Hu]

Hi, AngeloGioacchino:

AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> 於
2022年1月18日 週二 下午9:38寫道：
>
> There is no need to zero out the newly allocated memory because we are
> duplicating all members of struct mtk_plane_state: switch to kmalloc
> to save some overhead.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index c74cb94e445e..39cb9a80d976 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -57,7 +57,7 @@ static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane
>         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
>         struct mtk_plane_state *state;
>
> -       state = kzalloc(sizeof(*state), GFP_KERNEL);
> +       state = kmalloc(sizeof(*state), GFP_KERNEL);
>         if (!state)
>                 return NULL;
>
> --
> 2.33.1
>

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Re: [PATCH 1/2] drm: mediatek: mtk_drm_plane: Use kmalloc in mtk_plane_duplicate_state

[AngeloGioacchino Del Regno]

Il 25/01/22 17:36, Chun-Kuang Hu ha scritto:
> Hi, AngeloGioacchino:
> 
> AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> 於
> 2022年1月18日 週二 下午9:38寫道：
>>
>> There is no need to zero out the newly allocated memory because we are
>> duplicating all members of struct mtk_plane_state: switch to kmalloc
>> to save some overhead.
> 
> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
> 
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_drm_plane.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>

Hello,

this series was sent and reviewed two months ago, but it hasn't been picked
in any maintainer tree.

This is a friendly ping to not let these two patches to be lost and forgotten.

Cheers,
Angelo

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Re: [PATCH 1/2] drm: mediatek: mtk_drm_plane: Use kmalloc in mtk_plane_duplicate_state

[Chun-Kuang Hu]

Hi, Angelo:

AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> 於
2022年3月16日 週三 下午6:40寫道：
>
> Il 25/01/22 17:36, Chun-Kuang Hu ha scritto:
> > Hi, AngeloGioacchino:
> >
> > AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> 於
> > 2022年1月18日 週二 下午9:38寫道：
> >>
> >> There is no need to zero out the newly allocated memory because we are
> >> duplicating all members of struct mtk_plane_state: switch to kmalloc
> >> to save some overhead.
> >
> > Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
> >
> >>
> >> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> >> ---
> >>   drivers/gpu/drm/mediatek/mtk_drm_plane.c | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
>
> Hello,
>
> this series was sent and reviewed two months ago, but it hasn't been picked
> in any maintainer tree.
>
> This is a friendly ping to not let these two patches to be lost and forgotten.

For this series, applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

>
> Cheers,
> Angelo

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