linux-kernel - Re: [patch 16/18] init: Introduce SYSTEM_BOOTING

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Message-ID: <20170515105833.15763f9f@gandalf.local.home>
Date:   Mon, 15 May 2017 10:58:33 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [patch 16/18] init: Introduce SYSTEM_BOOTING_UP/SMP states

On Sun, 14 May 2017 20:27:32 +0200
Thomas Gleixner <tglx@...utronix.de> wrote:

> might_sleep() debugging should be active right after the scheduler starts
> working and smp_processor_id() debugging right before the first non boot
> cpu is brought up.
> 
> Add two new states which allow to enable those checks earlier and add them
> to the xen do_poweroff() function.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> ---
>  drivers/xen/manage.c   |    2 ++
>  include/linux/kernel.h |    2 ++
>  2 files changed, 4 insertions(+)
> 
> --- a/drivers/xen/manage.c
> +++ b/drivers/xen/manage.c
> @@ -190,6 +190,8 @@ static void do_poweroff(void)
>  {
>  	switch (system_state) {
>  	case SYSTEM_BOOTING:
> +	case SYSTEM_BOOTING_UP:
> +	case SYSTEM_BOOTING_SMP:
>  		orderly_poweroff(true);
>  		break;
>  	case SYSTEM_RUNNING:
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -493,6 +493,8 @@ extern bool early_boot_irqs_disabled;
>  /* Values used for system_state */
>  extern enum system_states {
>  	SYSTEM_BOOTING,
> +	SYSTEM_BOOTING_UP,
> +	SYSTEM_BOOTING_SMP,
>  	SYSTEM_RUNNING,
>  	SYSTEM_HALT,
>  	SYSTEM_POWER_OFF,
>