linux-kernel - Re: [PATCH 17/27] mn10300, smpboot: Use generic SMP booting infrastructure

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Date:	Sun, 3 Jun 2012 16:33:47 +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,
	David Howells <dhowells@...hat.com>,
	Koichi Yasutake <yasutake.koichi@...panasonic.com>,
	linux-am33-list@...hat.com
Subject: Re: [PATCH 17/27] mn10300, smpboot: Use generic SMP booting
 infrastructure

On Fri, Jun 01, 2012 at 02:44:08PM +0530, Srivatsa S. Bhat wrote:
> From: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
> 
> Convert mn10300 to use the generic framework to boot secondary CPUs.
> 
> Notes:
> 1. In order to avoid enabling interrupts very early during secondary CPU
> bringup (in smp_cpu_init()), use arch_local_save_flags() instead of
> arch_local_cli_save().

We can just remove arch_local_cli_save()/arch_local_irq_restore() IMHO.

Thanks,
Yong

> 
> Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Koichi Yasutake <yasutake.koichi@...panasonic.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Yong Zhang <yong.zhang0@...il.com>
> Cc: linux-am33-list@...hat.com
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> ---
> 
>  arch/mn10300/kernel/smp.c |   32 +++++++++++---------------------
>  1 files changed, 11 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c
> index b19e75d2..9c4e35e 100644
> --- a/arch/mn10300/kernel/smp.c
> +++ b/arch/mn10300/kernel/smp.c
> @@ -25,6 +25,7 @@
>  #include <linux/profile.h>
>  #include <linux/smp.h>
>  #include <linux/cpu.h>
> +#include <linux/smpboot.h>
>  #include <asm/tlbflush.h>
>  #include <asm/bitops.h>
>  #include <asm/processor.h>
> @@ -100,7 +101,6 @@ cpumask_t cpu_initialized __initdata = CPU_MASK_NONE;
>  static int do_boot_cpu(int);
>  static void smp_show_cpu_info(int cpu_id);
>  static void smp_callin(void);
> -static void smp_online(void);
>  static void smp_store_cpu_info(int);
>  static void smp_cpu_init(void);
>  static void smp_tune_scheduling(void);
> @@ -607,7 +607,7 @@ static void __init smp_cpu_init(void)
>  	mn10300_ipi_shutdown(SMP_BOOT_IRQ);
>  
>  	/* Set up the non-maskable call function IPI */
> -	flags = arch_local_cli_save();
> +	flags = arch_local_save_flags();
>  	GxICR(CALL_FUNCTION_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT;
>  	tmp16 = GxICR(CALL_FUNCTION_NMI_IPI);
>  	arch_local_irq_restore(flags);
> @@ -655,20 +655,25 @@ void smp_prepare_cpu_init(void)
>   */
>  int __init start_secondary(void *unused)
>  {
> +	smpboot_start_secondary(unused);
> +	return 0;
> +}
> +
> +void __cpuinit __cpu_pre_starting(void *unused)
> +{
>  	smp_cpu_init();
>  	smp_callin();
>  	while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
>  		cpu_relax();
>  
>  	local_flush_tlb();
> -	preempt_disable();
> -	smp_online();
> +}
>  
> +void __cpuinit __cpu_post_online(void *unused)
> +{
>  #ifdef CONFIG_GENERIC_CLOCKEVENTS
>  	init_clockevents();
>  #endif
> -	cpu_idle();
> -	return 0;
>  }
>  
>  /**
> @@ -865,21 +870,6 @@ static void __init smp_callin(void)
>  	cpumask_set_cpu(cpu, &cpu_callin_map);
>  }
>  
> -/**
> - * smp_online - Set cpu_online_mask
> - */
> -static void __init smp_online(void)
> -{
> -	int cpu;
> -
> -	cpu = smp_processor_id();
> -
> -	notify_cpu_starting(cpu);
> -
> -	set_cpu_online(cpu, true);
> -
> -	local_irq_enable();
> -}
>  
>  /**
>   * smp_cpus_done -
> 
> --
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