linux-kernel - Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents

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Message-Id: <200709252207.02532.rjw@sisk.pl>
Date:	Tue, 25 Sep 2007 22:07:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.23-rc4-mm1 and -rc6-mm1: boot failure on HP nx6325, related to clockevents

On Tuesday, 25 September 2007 15:17, Thomas Gleixner wrote:
> On Tue, 2007-09-25 at 15:16 +0200, Rafael J. Wysocki wrote:
[--snip--]
> 
> I start to get desperate. Below is a patch, which moves the apic timer
> disable check after the calibration routine. Can you please apply on top
> of -hrt and add "noapictimer" to the command line ? Does it boot ?

2.6.23-rc7 with patch-2.6.23-rc7-hrt1.patch and the patch below applied boots
with noapictimer and doesn't boot without it.

Also, attached is the output of

# cat /proc/interrupts; sleep 10; cat /proc/interrupts

from the current mainline.

Greetings,
Rafael


> Index: linux-2.6.23-rc7/arch/x86_64/kernel/apic.c
> ===================================================================
> --- linux-2.6.23-rc7.orig/arch/x86_64/kernel/apic.c	2007-09-24 20:30:00.000000000 +0200
> +++ linux-2.6.23-rc7/arch/x86_64/kernel/apic.c	2007-09-25 15:05:32.000000000 +0200
> @@ -927,6 +927,7 @@ static void __init calibrate_APIC_clock(
>  
>  void __init setup_boot_APIC_clock (void)
>  {
> +#if 0
>  	/*
>  	 * The local apic timer can be disabled via the kernel commandline.
>  	 * Register the lapic timer as a dummy clock event source on SMP
> @@ -940,7 +941,7 @@ void __init setup_boot_APIC_clock (void)
>  			setup_APIC_timer();
>  		return;
>  	}
> -
> +#endif
>  	printk(KERN_INFO "Using local APIC timer interrupts.\n");
>  	calibrate_APIC_clock();
>  
> @@ -949,11 +950,13 @@ void __init setup_boot_APIC_clock (void)
>  	 * PIT/HPET going.  Otherwise register lapic as a dummy
>  	 * device.
>  	 */
> -	if (nmi_watchdog != NMI_IO_APIC)
> +	if (!disable_apic_timer && nmi_watchdog != NMI_IO_APIC)
>  		lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
> +#if 0
>  	else
>  		printk(KERN_WARNING "APIC timer registered as dummy,"
>  		       " due to nmi_watchdog=1!\n");
> +#endif
>  
>  	setup_APIC_timer();
>  }
> 
> 
> 
> 

-- 
"Premature optimization is the root of all evil." - Donald Knuth

View attachment "interrupts.txt" of type "text/x-log" (1396 bytes)