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From: John Baldwin <jhb@freebsd.org>
To: Konstantin Belousov <kostikbel@gmail.com>
Date: Fri, 14 Sep 2012 08:19:05 -0400
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Cc: Attilio Rao <attilio@freebsd.org>, svn-src-head@freebsd.org,
	svn-src-all@freebsd.org, src-committers@freebsd.org
Subject: Re: svn commit: r240475 - in head/sys: dev/hwpmc kern
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On Friday, September 14, 2012 12:20:31 am Konstantin Belousov wrote:
> On Thu, Sep 13, 2012 at 10:26:22PM +0000, Attilio Rao wrote:
> > Author: attilio
> > Date: Thu Sep 13 22:26:22 2012
> > New Revision: 240475
> > URL: http://svn.freebsd.org/changeset/base/240475
> > 
> > Log:
> >   Remove all the checks on curthread != NULL with the exception of some MD
> >   trap checks (eg. printtrap()).
> >   
> >   Generally this check is not needed anymore, as there is not a legitimate
> >   case where curthread != NULL, after pcpu 0 area has been properly
> >   initialized.
> I do not disagree with the patch, but I do with this statement.
> During the AP startup, there is indeed a window while curthread is NULL.
> Unfortunately, trying to panic there is worse then not panic.

Also during early BSP startup.  On x86 very early faults actually result in a 
BTX fault rather than a panic since we run with BTX's IDT for a bit in locore, 
etc.

-- 
John Baldwin