linux-kernel - Re: [PATCH 29/51] arm64, debug-monitors: Fix CPU hotplug callback registration

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Message-ID: <20140206114155.GL26035@mudshark.cambridge.arm.com>
Date:	Thu, 6 Feb 2014 11:41:55 +0000
From:	Will Deacon <will.deacon@....com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"paulus@...ba.org" <paulus@...ba.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"walken@...gle.com" <walken@...gle.com>,
	"ego@...ux.vnet.ibm.com" <ego@...ux.vnet.ibm.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 29/51] arm64, debug-monitors: Fix CPU hotplug callback
 registration

On Wed, Feb 05, 2014 at 10:09:58PM +0000, Srivatsa S. Bhat wrote:
> Subsystems that want to register CPU hotplug callbacks, as well as perform
> initialization for the CPUs that are already online, often do it as shown
> below:

[...]

> Fix the debug-monitors code in arm64 by using this latter form of callback
> registration.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Russell King <rmk+kernel@....linux.org.uk>
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> ---
> 
>  arch/arm64/kernel/debug-monitors.c |    6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
> index 636ba8b..959a16b 100644
> --- a/arch/arm64/kernel/debug-monitors.c
> +++ b/arch/arm64/kernel/debug-monitors.c
> @@ -155,12 +155,16 @@ static struct notifier_block os_lock_nb = {
>  
>  static int debug_monitors_init(void)
>  {
> +	cpu_maps_update_begin();
> +
>  	/* Clear the OS lock. */
>  	smp_call_function(clear_os_lock, NULL, 1);
>  	clear_os_lock(NULL);
>  
>  	/* Register hotplug handler. */
> -	register_cpu_notifier(&os_lock_nb);
> +	__register_cpu_notifier(&os_lock_nb);
> +
> +	cpu_maps_update_done();
>  	return 0;
>  }
>  postcore_initcall(debug_monitors_init);

  Acked-by: Will Deacon <will.deacon@....com>

Will
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