linux-kernel - Re: [PATCH] drm/exynos: constify exynos_drm_crtc_ops structures

Open Source and information security mailing list archives

Date:   Tue, 10 Jan 2017 11:18:28 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Bhumika Goyal <bhumirks@...il.com>
Cc:     julia.lawall@...6.fr, inki.dae@...sung.com,
        jy0922.shim@...sung.com, sw0312.kim@...sung.com,
        kyungmin.park@...sung.com, airlied@...ux.ie, kgene@...nel.org,
        krzk@...nel.org, javier@....samsung.com,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/exynos: constify exynos_drm_crtc_ops structures

On Mon, Jan 09, 2017 at 11:24:53PM +0530, Bhumika Goyal wrote:
> Declare exynos_drm_crtc_ops structures as const as they are only passed
> as an argument to the function exynos_drm_crtc_create. This argument is
> of type const struct exynos_drm_crtc_ops *, so exynos_drm_crtc_ops
> structures having this property can be declared const.
> Done using Coccinelle:
> 
> @r disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct exynos_drm_crtc_ops i@......};
> 
> @ok@
> position p;
> identifier r.i;
> @@
> exynos_drm_crtc_create(...,&i@p,...)
> 
> @bad@
> position p!={r.p,ok.p};
> identifier r.i;
> @@
> i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r.i;
> @@
> +const
> struct exynos_drm_crtc_ops i;
> 
> File size before:
>    text	   data	    bss	    dec	    hex	filename
>    5008	    280	      0	   5288	   14a8	exynos/exynos5433_drm_decon.o
> 
> File size after:
>    text	   data	    bss	    dec	    hex	filename
>    5120	    176	      0	   5296	   14b0 exynos/exynos5433_drm_decon.o
> 
> Signed-off-by: Bhumika Goyal <bhumirks@...il.com>

Applied to drm-misc, thanks.
-Daniel

> ---
>  drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> index 6ca1f31..12b9bf0 100644
> --- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> +++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
> @@ -470,7 +470,7 @@ static void decon_clear_channels(struct exynos_drm_crtc *crtc)
>  		clk_disable_unprepare(ctx->clks[i]);
>  }
>  
> -static struct exynos_drm_crtc_ops decon_crtc_ops = {
> +static const struct exynos_drm_crtc_ops decon_crtc_ops = {
>  	.enable			= decon_enable,
>  	.disable		= decon_disable,
>  	.enable_vblank		= decon_enable_vblank,
> -- 
> 1.9.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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