linux-kernel - Re: [patch 07/18] ACPI: Adjust system

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Date:   Mon, 15 May 2017 10:27:00 -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>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, linux-acpi@...r.kernel.org,
        Len Brown <lenb@...nel.org>
Subject: Re: [patch 07/18] ACPI: Adjust system_state check


[ added linux-acpi and took off arm list ;-) ]

On Sun, 14 May 2017 20:27:23 +0200
Thomas Gleixner <tglx@...utronix.de> wrote:

> To enable smp_processor_id() and might_sleep() debug checks earlier, it's
> required to add system states between SYSTEM_BOOTING and SYSTEM_RUNNING.
> 
> Make the decision wether a pci root is hotplugged depend on SYSTEM_RUNNING
> instead of !SYSTEM_BOOTING.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>  drivers/acpi/pci_root.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -523,7 +523,7 @@ static int acpi_pci_root_add(struct acpi
>  	struct acpi_pci_root *root;
>  	acpi_handle handle = device->handle;
>  	int no_aspm = 0;
> -	bool hotadd = system_state != SYSTEM_BOOTING;
> +	bool hotadd = system_state == SYSTEM_RUNNING;

What about the other boot states greater than SYSTEM_RUNNING? Can this
be called then too?

IOW, should it be:

	bool hotadd = system_state >= SYSTEM_RUNNING;

?

-- Steve

>  
>  	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
>  	if (!root)
>