linux-kernel - Re: [PATCH] mx3fb: Fix print format string

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Date:   Fri, 26 Aug 2016 20:18:06 -0700
From:   Joe Perches <joe@...ches.com>
To:     Oleg Drokin <green@...uxhacker.ru>,
        Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        "Luis R. Rodriguez" <mcgrof@...e.com>
Cc:     linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mx3fb: Fix print format string

On Fri, 2016-08-26 at 23:05 -0400, Oleg Drokin wrote:
> %ul was probably meant as %lu since the former would print
> an unsigned value and a letter l.
> 
> But in fact the whole value we are printing in u32 anyway, so
> we don't need the format to be long. Therefore just drop the l
> altogether.
[]
> Also do we really need 1000UL specification if we
> cast to u32 anyway? Or should we drop away the cast instead?
> Are pixelclocks over 4GHz possible here?

It's a debugging printk, it doesn't matter much.
Why not use "%u kHz" and drop the "* 1000UL"?

> diff --git a/drivers/video/fbdev/mx3fb.c b/drivers/video/fbdev/mx3fb.c
[]
> @@ -845,7 +845,7 @@ static int __set_par(struct fb_info *fbi, bool lock)
>  		if (fbi->var.sync & FB_SYNC_SHARP_MODE)
>  			mode = IPU_PANEL_SHARP_TFT;
>  
> -		dev_dbg(fbi->device, "pixclock = %ul Hz\n",
> +		dev_dbg(fbi->device, "pixclock = %u Hz\n",
>  			(u32) (PICOS2KHZ(fbi->var.pixclock) * 1000UL));
>  
>  		if (sdc_init_panel(mx3fb, mode,