linux-kernel - Re: [PATCH v2 02/26] arm64: convert handle_IRQ to use __handle_domain

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Date:	Tue, 26 Aug 2014 17:51:38 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
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Subject: Re: [PATCH v2 02/26] arm64: convert handle_IRQ to use
 __handle_domain_irq

On Tue, Aug 26, 2014 at 11:03:17AM +0100, Marc Zyngier wrote:
> In order to limit code duplication, convert the architecture specific
> handle_IRQ to use the generic __handle_domain_irq function.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  arch/arm64/Kconfig      |  1 +
>  arch/arm64/kernel/irq.c | 18 +-----------------
>  2 files changed, 2 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index fd4e81a..1f16ed9 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -30,6 +30,7 @@ config ARM64
>  	select GENERIC_STRNCPY_FROM_USER
>  	select GENERIC_STRNLEN_USER
>  	select GENERIC_TIME_VSYSCALL
> +	select HANDLE_DOMAIN_IRQ
>  	select HARDIRQS_SW_RESEND
>  	select HAVE_ARCH_AUDITSYSCALL
>  	select HAVE_ARCH_JUMP_LABEL
> diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
> index 0f08dfd..2c0e2a7 100644
> --- a/arch/arm64/kernel/irq.c
> +++ b/arch/arm64/kernel/irq.c
> @@ -48,23 +48,7 @@ int arch_show_interrupts(struct seq_file *p, int prec)
>   */
>  void handle_IRQ(unsigned int irq, struct pt_regs *regs)
>  {
> -	struct pt_regs *old_regs = set_irq_regs(regs);
> -
> -	irq_enter();
> -
> -	/*
> -	 * Some hardware gives randomly wrong interrupts.  Rather
> -	 * than crashing, do something sensible.
> -	 */
> -	if (unlikely(irq >= nr_irqs)) {
> -		pr_warn_ratelimited("Bad IRQ%u\n", irq);
> -		ack_bad_irq(irq);
> -	} else {
> -		generic_handle_irq(irq);
> -	}
> -
> -	irq_exit();
> -	set_irq_regs(old_regs);
> +	__handle_domain_irq(NULL, irq, false, regs);
>  }

The only thing that's missing is a pr_warn_ratelimited(). Do we still
need it? We could add it to ack_bad_irq() though.

Either way:

Acked-by: Catalin Marinas <catalin.marinas@....com>
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