linux-kernel - Re: [PATCH] percpu: fix unit_map[] verification in pcpu_setup_first

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Message-ID: <4AC15197.9010105@kernel.org>
Date:	Tue, 29 Sep 2009 09:15:19 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Tony Vroon <tony@...x.net>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] percpu: fix unit_map[] verification in pcpu_setup_first_chunk()

Tony Vroon wrote:
> On Tue, 2009-09-29 at 01:19 +0900, Tejun Heo wrote:
>> pcpu_setup_first_chunk() incorrectly used NR_CPUS as the impossible
>> unit number while unit number can equal and go over NR_CPUS with
>> sparse unit map.  This triggers BUG_ON() spuriously on machines which
>> have non-power-of-two number of cpus.  Use UINT_MAX instead.
>>
>> Signed-off-by: Tejun Heo <tj@...nel.org>
>> Reported-by: Tony Vroon <tony@...x.net>
> Tested-by: Tony Vroon <tony@...x.net>
> 
>> Erghh... stupid mistake.  This should fix it.  Can you please verify?
> 
> Confirmed fixed. Thank you Tejun.

Thank you.  Will push out later today.

-- 
tejun
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