linux-kernel - Re: [PATCH] Removes extra checking in kernel/cpuset.c

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Message-ID: <6599ad830807311009o4275c0d0k84d4a5d4eadc3f41@mail.gmail.com>
Date:	Thu, 31 Jul 2008 10:09:42 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Paul Jackson" <pj@....com>
Cc:	"Rakib Mullick" <rakib.mullick@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Removes extra checking in kernel/cpuset.c

On Thu, Jul 31, 2008 at 9:15 AM, Paul Jackson <pj@....com> wrote:
> Rakib wrote:
>> Hello guys, this patch removes an extra checking over 'cs' in
>> functions 'guarantee_online_cpus' and 'guarantee_online_mems'.
>> ...
>> -     while (cs && !cpus_intersects(cs->cpus_allowed, cpu_online_map))
>> -             cs = cs->parent;
>> -     if (cs)
>> +     if (cs) {
>> +             while (!cpus_intersects(cs->cpus_allowed, cpu_online_map))
>> +                     cs = cs->parent;
>
> I don't think that works - "cs->parent" can be NULL, and will be NULL
> if cs is the root cpuset.

True, but if top_cpuset.cpus_allowed doesn't intersect with
cpu_online_map then maybe we have other problems?

Paul
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