linux-kernel - Re: [PATCH] video: fbdev: s3c-fb: remove redundant initialization of pointer bufs

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Date:   Fri, 14 Jan 2022 17:58:59 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Jingoo Han <jingoohan1@...il.com>, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, llvm@...ts.linux.dev,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: fbdev: s3c-fb: remove redundant initialization of
 pointer bufs

On Thu, Dec 30, 2021 at 04:06:26PM +0000, Colin Ian King wrote:
> Pointer bufs is being initialized with a value that is never read, it
> is being re-assigned with a different value later on. The assignment
> is redundant and can be removed. Cleans up clang-scan warning:
> 
> drivers/video/fbdev/s3c-fb.c:492:16: warning: Value stored to 'buf'
> during its initialization is never read [deadcode.DeadStores]
>         void __iomem *buf = regs;
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

Both of your dead store fixes queued up in drm-misc-next for 5.18.
-Daniel

> ---
>  drivers/video/fbdev/s3c-fb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbdev/s3c-fb.c b/drivers/video/fbdev/s3c-fb.c
> index 3b134e1bbc38..68408c499627 100644
> --- a/drivers/video/fbdev/s3c-fb.c
> +++ b/drivers/video/fbdev/s3c-fb.c
> @@ -489,7 +489,7 @@ static int s3c_fb_set_par(struct fb_info *info)
>  	struct s3c_fb_win *win = info->par;
>  	struct s3c_fb *sfb = win->parent;
>  	void __iomem *regs = sfb->regs;
> -	void __iomem *buf = regs;
> +	void __iomem *buf;
>  	int win_no = win->index;
>  	u32 alpha = 0;
>  	u32 data;
> -- 
> 2.33.1
> 

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