linux-kernel - Re: [PATCH V2 06/15] genirq: Generic chip: Optimize for fixed-endian systems

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Date:	Wed, 29 Oct 2014 21:16:58 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Kevin Cernekee <cernekee@...il.com>
Cc:	arnd@...db.de, f.fainelli@...il.com, tglx@...utronix.de,
	jason@...edaemon.net, ralf@...ux-mips.org, lethal@...ux-sh.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	mbizon@...ebox.fr, jogo@...nwrt.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH V2 06/15] genirq: Generic chip: Optimize for fixed-endian
 systems

On Wed, Oct 29, 2014 at 07:17:59PM -0700, Kevin Cernekee wrote:
> @@ -19,7 +20,14 @@ static DEFINE_RAW_SPINLOCK(gc_lock);
>  
>  static int is_big_endian(struct irq_chip_generic *gc)
>  {
> -	return !!(gc->domain->gc->gc_flags & IRQ_GC_BE_IO);
> +	if (IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP) &&
> +	    !IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP_BE))
> +		return 0;
> +	else if (IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP_BE) &&
> +		 !IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP))
> +		return 1;

Would XOR make this any easier to read? e.g.:

	if (IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP) ^
	    IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP_BE))
		return IS_ENABLED(CONFIG_GENERIC_IRQ_CHIP_BE);
	else
		...

> +	else
> +		return !!(gc->domain->gc->gc_flags & IRQ_GC_BE_IO);
>  }
>  
>  static void irq_reg_writel(struct irq_chip_generic *gc,

Brian
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