From: Keith Owens <kaos@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [RFC Patch]Use ar.kr2 for smp_processor_id
Date: Thu, 08 Feb 2007 06:04:30 +0000 [thread overview]
Message-ID: <6737.1170914670@kao2.melbourne.sgi.com> (raw)
In-Reply-To: <1170905324.3230.7.camel@linux-znh>
Zou Nan hai (on 08 Feb 2007 11:28:44 +0800) wrote:
>Pin ar.kr2 of each CPU, so that smp_processor_id can use it.
Historically ar.k2 has been reserved for debugging purposes, for
example in ivt.S. Debuggers often need a location that can be used to
track progress, it has to be somewhere that does not rely on TLB
entries and is guaranteed to appear in MCA/INIT records - ar.k2 is
perfect for this.
Use Tony's suggestion of testing for a change in ar.k3 (guaranteed to
be unique on every cpu) and caching the corresponding cpu number when
it changes.
next prev parent reply other threads:[~2007-02-08 6:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-08 3:28 [RFC Patch]Use ar.kr2 for smp_processor_id Zou Nan hai
2007-02-08 4:27 ` Zou Nan hai
2007-02-08 4:59 ` Zou Nan hai
2007-02-08 5:11 ` Zou Nan hai
2007-02-08 6:04 ` Keith Owens [this message]
2007-02-08 6:37 ` Keith Owens
2007-02-08 6:55 ` Keith Owens
2007-02-08 7:14 ` Zou Nan hai
2007-02-08 7:38 ` Zou Nan hai
2007-02-08 8:28 ` peterc
2007-02-08 8:40 ` Keith Owens
2007-02-08 18:03 ` Luck, Tony
2007-02-08 23:59 ` Keith Owens
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