linux-kernel - Re: Regression in 2.6.27-rc1 for set_cpus_allowed

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Message-ID: <alpine.LFD.1.10.0808111500330.3462@nehalem.linux-foundation.org>
Date:	Mon, 11 Aug 2008 15:03:14 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Langsdorf, Mark" <mark.langsdorf@....com>,
	lkml <linux-kernel@...r.kernel.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Regression in 2.6.27-rc1 for set_cpus_allowed_ptr



On Mon, 11 Aug 2008, Ingo Molnar wrote:
> 
> i've queued up the fix below in tip/sched/urgent.
> 
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index e202a68..c977c33 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -349,6 +349,8 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
>  		goto out_notify;
>  	BUG_ON(!cpu_online(cpu));
>  
> +	cpu_set(cpu, cpu_active_map);
> +
>  	/* Now call notifier in preparation. */
>  	raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu);
>  
> @@ -383,9 +385,6 @@ int __cpuinit cpu_up(unsigned int cpu)
>  
>  	err = _cpu_up(cpu, 0);
>  
> -	if (cpu_online(cpu))
> -		cpu_set(cpu, cpu_active_map);
> -

Ok, not only does that fix the bug, but it simplifies the code and looks 
obviously ok. However, I don't have it in my tree yet, and I'd like to do 
an -rc3 that has this fixes (so that along with the PCI MSI thing, we 
hopefully have most of the suspend/resume regressions fixed).

And I was hoping to do -rc3 today. Can I please have pull-requests for the 
appropriate urgent scheduler/x86 fixes? Or should I just take these as 
patches?

		Linus
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