linux-kernel - Re: v2.6.26-rc7: BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <4861085D.8020506@sgi.com>
Date:	Tue, 24 Jun 2008 07:44:45 -0700
From:	Mike Travis <travis@....com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Adrian Bunk <bunk@...nel.org>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	linux-kernel@...r.kernel.org, Gautham R Shenoy <ego@...ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: v2.6.26-rc7: BUG: unable to handle kernel NULL pointer dereference

Rusty Russell wrote:
...
> Nice catch.  Basically, cpu_possible_map should only be cleared at boot, and 
> probably not even then.
> 

One thing that should be avoided, is clearing anything but the last bit in the
cpu_possible_map.  This is because num_possible_cpus != nr_cpu_ids when there
are holes in the map.  (nr_cpu_ids = highest possible cpu # + 1).

Thanks,
Mike
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