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From: Rusty Russell <rusty@rustcorp.com.au>
To: Mike Travis <travis@sgi.com>
Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
	Vegard Nossum <vegard.nossum@gmail.com>,
	Adrian Bunk <bunk@kernel.org>,
	Srivatsa Vaddagiri <vatsa@in.ibm.com>,
	linux-kernel@vger.kernel.org, Gautham R Shenoy <ego@in.ibm.com>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	"Zhang, Yanmin" <yanmin.zhang@intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: v2.6.26-rc7: BUG: unable to handle kernel NULL pointer dereference
Date: Wed, 25 Jun 2008 15:38:45 +1000	[thread overview]
Message-ID: <200806251538.45795.rusty@rustcorp.com.au> (raw)
In-Reply-To: <4861085D.8020506@sgi.com>

On Wednesday 25 June 2008 00:44:45 Mike Travis wrote:
> 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).

It's ok if nr_cpu_ids is an overestimate, isn't it?

But for this corner case, I think clearing cpu_possible_map is wrong.

Cheers,
Rusty.

  reply	other threads:[~2008-06-25  5:39 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-22 12:56 v2.6.26-rc7: BUG: unable to handle kernel NULL pointer dereference Vegard Nossum
2008-06-22 14:47 ` Vegard Nossum
2008-06-22 14:54   ` Vegard Nossum
2008-06-22 15:56     ` Adrian Bunk
2008-06-22 16:29       ` Vegard Nossum
2008-06-23  3:26         ` Rusty Russell
2008-06-23 16:58           ` Mike Travis
2008-06-24  1:36             ` Rusty Russell
2008-06-24  7:40               ` Vegard Nossum
2008-06-24  8:06               ` Zhang, Yanmin
2008-06-24  8:37                 ` Vegard Nossum
2008-06-24 13:14                 ` Rusty Russell
2008-06-24 14:44                   ` Mike Travis
2008-06-25  5:38                     ` Rusty Russell [this message]
2008-06-25 15:06                       ` Mike Travis
2008-06-26 12:58                   ` Gautham R Shenoy
2008-06-27  3:16                     ` Rusty Russell
2008-06-30 11:19                   ` Ingo Molnar
2008-06-26  0:59                 ` Zhang, Yanmin
2008-06-26  2:15                   ` Andrew Morton
2008-06-26  9:00                     ` Vegard Nossum
2008-06-26 12:40                       ` Jason Wessel
2008-06-26 13:59                         ` Vegard Nossum
2008-07-10 19:10                 ` Vegard Nossum

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