linux-kernel - Re: [PATCH 2/9] irq-remove: arch non-trivial

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Date:	Fri, 19 Oct 2007 09:54:12 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeff Garzik <jeff@...zik.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH 2/9] irq-remove: arch non-trivial

Jeff Garzik wrote:
> commit 8d45690dd90b18daaa21b981ab20caf393220bf0
> Author: Jeff Garzik <jeff@...zik.org>
> Date:   Fri Oct 19 00:46:23 2007 -0400
>
>     [IRQ ARG REMOVAL] various non-trivial arch updates
>
>  arch/x86/kernel/vm86_32.c     |    3 ++-
>  include/asm-x86/irq_regs_32.h |   25 +++++++++++++++++++++++++
>  2 files changed, 27 insertions(+), 1 deletion(-)
>
> 8d45690dd90b18daaa21b981ab20caf393220bf0
> diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
> index 157e4be..18aae9e 100644
> --- a/arch/x86/kernel/vm86_32.c
> +++ b/arch/x86/kernel/vm86_32.c
> @@ -739,10 +739,11 @@ static int irqbits;
>  	| (1 << SIGUSR1) | (1 << SIGUSR2) | (1 << SIGIO)  | (1 << SIGURG) \
>  	| (1 << SIGUNUSED) )
>  	
> -static irqreturn_t irq_handler(int intno, void *dev_id)
> +static irqreturn_t irq_handler(void *dev_id)
>  {
>  	int irq_bit;
>  	unsigned long flags;
> +	unsigned int intno = get_irqfunc_irq();
>  
>  	spin_lock_irqsave(&irqbits_lock, flags);	
>  	irq_bit = 1 << intno;
> diff --git a/include/asm-x86/irq_regs_32.h b/include/asm-x86/irq_regs_32.h
> index 3368b20..68a531d 100644
> --- a/include/asm-x86/irq_regs_32.h
> +++ b/include/asm-x86/irq_regs_32.h
> @@ -26,4 +26,29 @@ static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
>  	return old_regs;
>  }
>  
> +DECLARE_PER_CPU(unsigned int, __irqfunc_irqs);
> +
> +static inline unsigned int get_irqfunc_irq(void)
> +{
> +	return __get_cpu_var(__irqfunc_irqs);
> +}
> +
> +#if 0
> +static inline unsigned int set_irqfunc_irq(unsigned int new_irq)
> +{
> +	unsigned int old_irq, *pirq = &__get_cpu_var(__irqfunc_irqs);
> +
> +	old_irq = *pirq;
> +	*pirq = new_irq;
> +	return old_irq;
> +}
> +#else
> +static inline void set_irqfunc_irq(unsigned int new_irq)
> +{
> +	int *pirq = &__get_cpu_var(__irqfunc_irqs);
> +
> +	*pirq = new_irq;
>   

x86_write_percpu(__irqfunc_irqs, new_irq) would be slightly more
efficient here.  Any why the pointer anyway?

    J
-
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