linux-kernel - Re: [PATCH 2/2 v3] SGI RTC: add RTC system interrupt

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Message-ID: <20081027140829.GD5704@elte.hu>
Date:	Mon, 27 Oct 2008 15:08:29 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dimitri Sivanich <sivanich@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v3] SGI RTC: add RTC system interrupt


* Dimitri Sivanich <sivanich@....com> wrote:

> +void uv_rtc_timer_interrupt(struct pt_regs *regs)
> +{
> +	struct pt_regs *old_regs = set_irq_regs(regs);
> +
> +	ack_APIC_irq();
> +
> +	exit_idle();
> +
> +	irq_enter();
> +
> +	if (uv_rtc_interrupt_extension)
> +		uv_rtc_interrupt_extension();
> +
> +	irq_exit();
> +
> +	set_irq_regs(old_regs);
> +}

hm, the exit_idle() looks weird - why is it done? If we get an IRQ 
then the CPU will exit idle state anyway.

	Ingo
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