linux-kernel - Re: [PATCH] ARM: integrator: use BUG

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Date:	Mon, 12 Nov 2012 20:44:13 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Rob Herring <rob.herring@...xeda.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Howells <dhowells@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: Re: [PATCH] ARM: integrator: use BUG_ON where possible

On Thursday 08 November 2012, Sasha Levin wrote:
> Just use BUG_ON() instead of constructions such as:
> 
> 	if (...)
> 		BUG()
> 
> A simplified version of the semantic patch that makes this transformation
> is as follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e;
> @@
> - if (e) BUG();
> + BUG_ON(e);
> // </smpl>
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>

Linus Walleij is doing most of the integrator work these days, maybe he
wants to apply the patch.

Acked-by: Arnd Bergmann <arnd@...db.de>

>  arch/arm/mach-integrator/pci_v3.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/mach-integrator/pci_v3.c b/arch/arm/mach-integrator/pci_v3.c
> index bbeca59..85938de 100644
> --- a/arch/arm/mach-integrator/pci_v3.c
> +++ b/arch/arm/mach-integrator/pci_v3.c
> @@ -191,12 +191,9 @@ static void __iomem *v3_open_config_window(struct pci_bus *bus,
>  	/*
>  	 * Trap out illegal values
>  	 */
> -	if (offset > 255)
> -		BUG();
> -	if (busnr > 255)
> -		BUG();
> -	if (devfn > 255)
> -		BUG();
> +	BUG_ON(offset > 255);
> +	BUG_ON(busnr > 255);
> +	BUG_ON(devfn > 255);
>  
>  	if (busnr == 0) {
>  		int slot = PCI_SLOT(devfn);
> -- 
> 1.7.10.4
> 
> 

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