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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 27 Oct 2008 10:29:40 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Ingo Molnar <mingo@...e.hu>
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

On Mon, Oct 27, 2008 at 03:08:29PM +0100, Ingo Molnar wrote:
> 
> * 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,

I'm not quite sure what you mean here.  Are you referring to an explicit call to exit_idle() that is done somewhere else (such as do_IRQ())?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/