linux-kernel - disabled APICs being counted as processors ?

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Date:	Thu, 23 Jan 2014 17:13:16 -0500
From:	Dave Jones <davej@...hat.com>
To:	x86@...nel.org
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: disabled APICs being counted as processors ?

I have a system with 4 cores (configured with CONFIG_NR_CPUS=4) that shows during boot..

[    0.000000] smpboot: 8 Processors exceeds NR_CPUS limit of 4

it looks like this is because..

[    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x04] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x06] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0xff] disabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0xff] disabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0xff] disabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0xff] disabled)

Should the CPU counting code be ignoring those disabled APICs ?

	Dave
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