linux-kernel - Re: [PATCH] arm: fix compilation warning during compilation

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Message-ID: <20101108091302.GO16938@pengutronix.de>
Date:	Mon, 8 Nov 2010 10:13:02 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, Sanjeev Premi <premi@...com>
Subject: Re: [PATCH] arm: fix compilation warning during compilation

Hello,

On Sat, Nov 06, 2010 at 10:06:35AM +0100, Marco Stornelli wrote:
> From: Marco Stornelli <marco.stornelli@...il.com>
> 
> During compilation of 2.6.36 for Beagle board, there a are a couple of warnings. This patch fix them.
Please break lines for commit logs at around 76 chars and mention the
exact compiler warning being fixed.

> 
> Signed-off-by: Marco Stornelli <marco.stornelli@...il.com>
> ---
> 
> --- linux-2.6.36-orig/arch/arm/plat-omap/include/plat/usb.h	2010-10-20 22:30:22.000000000 +0200
> +++ linux-2.6.36/arch/arm/plat-omap/include/plat/usb.h	2010-11-01 09:44:13.000000000 +0100
> @@ -105,7 +105,7 @@ static inline void omap1_usb_init(struct
>  #if defined(CONFIG_ARCH_OMAP_OTG) || defined(CONFIG_ARCH_OMAP_OTG_MODULE)
>  void omap2_usbfs_init(struct omap_usb_config *pdata);
>  #else
> -static inline omap2_usbfs_init(struct omap_usb_config *pdata)
> +static inline void omap2_usbfs_init(struct omap_usb_config *pdata)
>  {
>  }
>  #endif
> --- linux-2.6.36-orig/arch/arm/mach-omap2/mux.c	2010-10-20 22:30:22.000000000 +0200
> +++ linux-2.6.36/arch/arm/mach-omap2/mux.c	2010-11-01 10:21:29.000000000 +0100
> @@ -87,7 +87,7 @@ static char *omap_mux_options;
>  int __init omap_mux_init_gpio(int gpio, int val)
>  {
>  	struct omap_mux_entry *e;
> -	struct omap_mux *gpio_mux;
> +	struct omap_mux *gpio_mux = NULL;
this warning is already fixed by ca82876 (omap2: fix assorted compiler
warnings).

As this warning is a false positive (i.e. gpio_mux is never used
uninitialized), making the line read

	struct omap_mux *uninitialized_var(gpio_mux);

(IMHO) would have been a bit better for both, readabily and (probably)
generated code.

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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