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From: Keith Owens <kaos@ocs.com.au>
To: "Amit S. Kale" <kgdb@vsnl.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: announce: kgdb 1.5 with reworked buggy smp handling 
In-Reply-To: Your message of "Fri, 29 Mar 2002 20:33:19 +0530."
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Date: Sat, 30 Mar 2002 11:17:21 +1100
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On Fri, 29 Mar 2002 20:33:19 +0530, 
"Amit S. Kale" <kgdb@vsnl.net> wrote:
>Keith Owens wrote:
>> 
>> On Fri, 29 Mar 2002 16:01:36 +0530,
>> "Amit S. Kale" <kgdb@vsnl.net> wrote:
>> >kgdb 1.5 at http://kgdb.sourceforge.net/
>> >
>> >smp handling is completely reworked. Previous kgdb had a bug
>> >which caused it to hang when a processor spun with
>> >interrupts disabled and another processor enters kgdb. kgdb
>> >now uses nmi watchdog for holding other processors while
>> >a machine is in kgdb.
>> 
>> IA64 disabled spin loops ignore NMI :(.
>
>Thanks for the info.
>
>Isn't there any way get into an interrupt disabled spinning
>processor on an ia64 smp machine?

Only via an INIT interrupt.  But that is also used to initialise a cpu
at startup, INIT interrupts go through PAL and SAL and have side
effects.  I don't use them for kdb, they are too heavy.

For more background, see the thread "Replacements for local_irq_xxx()"
https://external-lists.vasoftware.com/archives//linux-ia64/2001-May/thread.html

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