Re: [tip:x86/urgent] x86: Detect use of extended APIC ID for AMDCPUs

[Ingo Molnar]

* tip-bot for Andreas Herrmann <andreas.herrmann3@xxxxxxx> wrote:

> +#ifdef CONFIG_X86_LOCAL_APIC
> +	/* check CPU config space for extended APIC ID */
> +	if (c->x86 >= 0xf) {
> +		unsigned int val;
> +
> +		val = read_pci_config(0, 24, 0, 0x68);
> +		if ((val & ((1 << 17) | (1 << 18))) == ((1 << 17) | (1 << 18)))
> +			set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
> +	}
> +#endif

It's possible to enable local APIC but not CONFIG_PCI - in that case 
this sequence will fail to build.

	Ingo
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