linux-kernel - Re: [Outreachy kernel] [PATCH] drm: Replace kzalloc with kcalloc

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Message-ID: <alpine.DEB.2.20.1710130751031.3147@hadrien>
Date:   Fri, 13 Oct 2017 07:51:57 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Harsha Sharma <harshasharmaiitr@...il.com>
cc:     daniel.vetter@...ll.ch, seanpaul@...omium.org,
        jani.nikula@...ux.intel.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] drm: Replace kzalloc with kcalloc



On Fri, 13 Oct 2017, Harsha Sharma wrote:

> Prefer kcalloc over kzalloc to allocate an array.
> This patch fixes checkcpatch issue.
>
> Signed-off-by: Harsha Sharma <harshasharmaiitr@...il.com>
> ---
>  drivers/gpu/drm/drm_crtc_helper.c  | 4 ++--
>  drivers/gpu/drm/drm_fb_helper.c    | 2 +-
>  drivers/gpu/drm/drm_plane_helper.c | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index eab36a460638..ceb131637e2f 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -562,12 +562,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set,
>  	 * Allocate space for the backup of all (non-pointer) encoder and
>  	 * connector data.
>  	 */
> -	save_encoder_crtcs = kzalloc(dev->mode_config.num_encoder *
> +	save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder *
>  				sizeof(struct drm_crtc *), GFP_KERNEL);

Doesn't kcalloc take 3 arguments?  You need to compile the code and check
that you have obtained a .o file for the file you modified.

julia

>  	if (!save_encoder_crtcs)
>  		return -ENOMEM;
>
> -	save_connector_encoders = kzalloc(dev->mode_config.num_connector *
> +	save_connector_encoders = kcalloc(dev->mode_config.num_connector *
>  				sizeof(struct drm_encoder *), GFP_KERNEL);
>  	if (!save_connector_encoders) {
>  		kfree(save_encoder_crtcs);
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 1b8f013ffa65..68d197df89fd 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2266,7 +2266,7 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
>  	if (modes[n] == NULL)
>  		return best_score;
>
> -	crtcs = kzalloc(fb_helper->connector_count *
> +	crtcs = kcalloc(fb_helper->connector_count *
>  			sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
>  	if (!crtcs)
>  		return best_score;
> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
> index 06aee1741e96..74054653530e 100644
> --- a/drivers/gpu/drm/drm_plane_helper.c
> +++ b/drivers/gpu/drm/drm_plane_helper.c
> @@ -354,7 +354,7 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
>  	/* Find current connectors for CRTC */
>  	num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
>  	BUG_ON(num_connectors == 0);
> -	connector_list = kzalloc(num_connectors * sizeof(*connector_list),
> +	connector_list = kcalloc(num_connectors * sizeof(*connector_list),
>  				 GFP_KERNEL);
>  	if (!connector_list)
>  		return -ENOMEM;
> --
> 2.11.0
>
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