linux-kernel - Re: [PATCH 24/51] x86, hpet: Fix CPU hotplug callback registration

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Message-ID: <20140210185843.GC3416@in.ibm.com>
Date:	Tue, 11 Feb 2014 00:28:43 +0530
From:	Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	paulus@...ba.org, oleg@...hat.com, rusty@...tcorp.com.au,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, mingo@...nel.org,
	paulmck@...ux.vnet.ibm.com, tj@...nel.org, walken@...gle.com,
	ego@...ux.vnet.ibm.com, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH 24/51] x86, hpet: Fix CPU hotplug callback registration

Hi,

On Thu, Feb 06, 2014 at 03:39:00AM +0530, Srivatsa S. Bhat wrote:
> diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
> index da85a8e..199aaae 100644
> --- a/arch/x86/kernel/hpet.c
> +++ b/arch/x86/kernel/hpet.c
> @@ -943,12 +943,14 @@ static __init int hpet_late_init(void)
>  	if (boot_cpu_has(X86_FEATURE_ARAT))
>  		return 0;
> 
> +	cpu_maps_update_begin();
>  	for_each_online_cpu(cpu) {
>  		hpet_cpuhp_notify(NULL, CPU_ONLINE, (void *)(long)cpu);
>  	}
> 
>  	/* This notifier should be called after workqueue is ready */
> -	hotcpu_notifier(hpet_cpuhp_notify, -20);
> +	__hotcpu_notifier(hpet_cpuhp_notify, -20);

We could #define HPET_CPUHP_PRIO relative to the workqueue priority instead of
hardcoding this it this way.


--
Thanks and Regards
gautham.

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