linux-kernel - Re: [PATCH 2.6.20] tasks cannot run on cpus onlined after boot

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Date:	Sun, 7 Jan 2007 16:48:04 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Nathan Lynch <ntl@...ox.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Nick Piggin <npiggin@...e.de>,
	Giuliano Pochini <pochini@...ny.it>
Subject: Re: [PATCH 2.6.20] tasks cannot run on cpus onlined after boot


* Nathan Lynch <ntl@...ox.com> wrote:

> Commit 5c1e176781f43bc902a51e5832f789756bff911b ("sched: force
> /sbin/init off isolated cpus") sets init's cpus_allowed to a subset of
> cpu_online_map at boot time, which means that tasks won't be scheduled
> on cpus that are added to the system later.
> 
> Make init's cpus_allowed a subset of cpu_possible_map instead.  This 
> should still preserve the behavior that Nick's change intended.
> 
> Thanks to Giuliano Pochini for reporting this and testing the fix:
> 
> http://ozlabs.org/pipermail/linuxppc-dev/2006-December/029397.html
> 
> Signed-off-by: Nathan Lynch <ntl@...ox.com>

nicely spotted!

> -	cpus_andnot(non_isolated_cpus, cpu_online_map, cpu_isolated_map);
> +	cpus_andnot(non_isolated_cpus, cpu_possible_map, cpu_isolated_map);

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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