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

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Date:	Sun, 03 Jun 2012 17:22:55 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Yong Zhang <yong.zhang0@...il.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 06/03/2012 02:11 PM, Yong Zhang wrote:

> 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.
> 


Good catch! I will remove that comment then, keeping the code in the
patch untouched.

Regards,
Srivatsa S. Bhat

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

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