linux-kernel - Re: [PATCH] drm/i915/gvt: use ARRAY

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Message-ID: <7cf685f7-6bb9-f857-095a-295510018623@intel.com>
Date:   Tue, 24 Oct 2017 00:38:37 +0800
From:   Zhi Wang <zhi.a.wang@...el.com>
To:     Jérémy Lefaure <jeremy.lefaure@....epita.fr>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>
Cc:     intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915/gvt: use ARRAY_SIZE

Thanks, applied!

On 10/16/17 10:32, Jérémy Lefaure wrote:
> Using the ARRAY_SIZE macro improves the readability of the code. Also,
> it's useless to use a variable to store this constant calculated at
> compile time.
> 
> Found with Coccinelle with the following semantic patch:
> @r depends on (org || report)@
> type T;
> T[] E;
> position p;
> @@
> (
>   (sizeof(E)@p /sizeof(*E))
> |
>   (sizeof(E)@p /sizeof(E[...]))
> |
>   (sizeof(E)@p /sizeof(T))
> )
> 
> Signed-off-by: Jérémy Lefaure <jeremy.lefaure@....epita.fr>
> ---
> This patch was part of a bigger patch [1].
> 
> [1]: https://patchwork.kernel.org/patch/9979843/
> 
>   drivers/gpu/drm/i915/gvt/vgpu.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
> index 02c61a1ad56a..b32c1c889ea8 100644
> --- a/drivers/gpu/drm/i915/gvt/vgpu.c
> +++ b/drivers/gpu/drm/i915/gvt/vgpu.c
> @@ -31,6 +31,7 @@
>    *
>    */
>   
> +#include <linux/kernel.h>
>   #include "i915_drv.h"
>   #include "gvt.h"
>   #include "i915_pvinfo.h"
> @@ -98,7 +99,6 @@ static struct {
>    */
>   int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
>   {
> -	unsigned int num_types;
>   	unsigned int i, low_avail, high_avail;
>   	unsigned int min_low;
>   
> @@ -116,15 +116,14 @@ int intel_gvt_init_vgpu_types(struct intel_gvt *gvt)
>   	 */
>   	low_avail = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE;
>   	high_avail = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE;
> -	num_types = sizeof(vgpu_types) / sizeof(vgpu_types[0]);
>   
> -	gvt->types = kzalloc(num_types * sizeof(struct intel_vgpu_type),
> -			     GFP_KERNEL);
> +	gvt->types = kzalloc(ARRAY_SIZE(vgpu_types) *
> +			     sizeof(struct intel_vgpu_type), GFP_KERNEL);
>   	if (!gvt->types)
>   		return -ENOMEM;
>   
>   	min_low = MB_TO_BYTES(32);
> -	for (i = 0; i < num_types; ++i) {
> +	for (i = 0; i < ARRAY_SIZE(vgpu_types); ++i) {
>   		if (low_avail / vgpu_types[i].low_mm == 0)
>   			break;
>   
>