linux-kernel - Re: [PATCH 23/27] cris, smpboot: Use generic SMP booting infrastructure

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Message-ID: <20120603084145.GC16829@zhy>
Date:	Sun, 3 Jun 2012 16:41:46 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	tglx@...utronix.de, peterz@...radead.org,
	paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org,
	vatsa@...ux.vnet.ibm.com, rjw@...k.pl, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, nikunj@...ux.vnet.ibm.com,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mike Frysinger <vapier@...too.org>, linux-cris-kernel@...s.com
Subject: Re: [PATCH 23/27] cris, smpboot: Use generic SMP booting
 infrastructure

On Fri, Jun 01, 2012 at 02:45:40PM +0530, Srivatsa S. Bhat wrote:
> Convert cris to use the generic framework to boot secondary CPUs.
> 
> Cc: Mikael Starvik <starvik@...s.com>
> Cc: Jesper Nilsson <jesper.nilsson@...s.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Mike Frysinger <vapier@...too.org>
> Cc: linux-cris-kernel@...s.com
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> ---
> 
>  arch/cris/arch-v32/kernel/smp.c |   14 ++++++--------
>  1 files changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c
> index ebe2cb3..357114a 100644
> --- a/arch/cris/arch-v32/kernel/smp.c
> +++ b/arch/cris/arch-v32/kernel/smp.c
> @@ -17,6 +17,7 @@
>  #include <linux/cpumask.h>
>  #include <linux/interrupt.h>
>  #include <linux/module.h>
> +#include <linux/smpboot.h>
>  
>  #define IPI_SCHEDULE 1
>  #define IPI_CALL 2
> @@ -145,8 +146,11 @@ smp_boot_one_cpu(int cpuid, struct task_struct idle)
>   * specific stuff such as the local timer and the MMU. */
>  void __init smp_callin(void)
>  {
> -	extern void cpu_idle(void);
> +	smpboot_start_secondary(NULL);
> +}
>  
> +void __cpuinit __cpu_pre_starting(void *unused)
> +{
>  	int cpu = cpu_now_booting;
>  	reg_intr_vect_rw_mask vect_mask = {0};
>  
> @@ -161,16 +165,10 @@ void __init smp_callin(void)
>  	/* Setup local timer. */
>  	cris_timer_init();
>  
> -	/* Enable IRQ and idle */
> +	/* Enable IRQ */

I don't know cris; is the comments right?

>  	REG_WR(intr_vect, irq_regs[cpu], rw_mask, vect_mask);
>  	crisv32_unmask_irq(IPI_INTR_VECT);
>  	crisv32_unmask_irq(TIMER0_INTR_VECT);
> -	preempt_disable();
> -	notify_cpu_starting(cpu);
> -	local_irq_enable();
> -
> -	set_cpu_online(cpu, true);
> -	cpu_idle();

Before your patch, the comments seems end here.

Thanks,
Yong

>  }
>  
>  /* Stop execution on this CPU.*/
--
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