linux-kernel - Re: [PATCH v5 2/2] x86/devicetree: Use CPU description from Device Tree

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Date:   Tue, 13 Mar 2018 11:03:29 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Ivan Gorinov <ivan.gorinov@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Frank Rowand <frowand.list@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v5 2/2] x86/devicetree: Use CPU description from Device
 Tree

On Mon, Mar 12, 2018 at 03:22:33PM -0700, Ivan Gorinov wrote:
> Current x86 Device Tree implementation does not support multiprocessing.
> Use new DT bindings to describe the processors.
> 
> Signed-off-by: Ivan Gorinov <ivan.gorinov@...el.com>
> ---
>  arch/x86/kernel/devicetree.c | 42 +++++++++++++++++++++++++++++++-----------
>  1 file changed, 31 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
> index 5cd387f..64671db 100644
> --- a/arch/x86/kernel/devicetree.c
> +++ b/arch/x86/kernel/devicetree.c
> @@ -131,31 +131,49 @@ static void __init dtb_setup_hpet(void)
>  #endif
>  }
>  
> +static void __init dtb_cpu_setup(void)
> +{
> +	struct device_node *dn;
> +	const void *prop;
> +	int prop_bytes;
> +	int apic_id, version;
> +	int ret;
> +
> +	version = GET_APIC_VERSION(apic_read(APIC_LVR));
> +	for_each_node_by_type(dn, "cpu") {
> +		prop = of_get_property(dn, "reg", &prop_bytes);
> +		if (!prop || prop_bytes < sizeof(u32)) {
> +			pr_warn("%pOF: missing local APIC ID\n", dn);
> +			continue;
> +		}
> +		apic_id = be32_to_cpup(prop);

Please use of_property_read_u32().

Thanks,
Mark.