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linux/arch/x86/kernel/acpi
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Thomas Gleixner f3bf1dbe64 x86/acpi: Prevent LAPIC id 0xff from being accounted 
Yinghai reported that the recent changes to make the cpuid - nodeid
relationship permanent causes a cpuid ordering regression on a system which
has 2apic enabled..

The reason is that the ACPI local APIC parser has no sanity check for
apicid 0xff, which is an invalid id. So a CPU id for this invalid local
APIC id is allocated and therefor breaks the cpuid ordering.

Add a sanity check to acpi_parse_lapic() which ignores the invalid id.

Fixes: 8f54969dc8 ("x86/acpi: Introduce persistent storage for cpuid <-> apicid mapping")
Reported-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Gu Zheng <guz.fnst@cn.fujitsu.com>,
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: douly.fnst@cn.fujitsu.com,
Cc: zhugh.fnst@cn.fujitsu.com
Cc: Tony Luck <tony.luck@intel.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: Lv Zheng <lv.zheng@intel.com>,
Cc: robert.moore@intel.com
Cc: linux-acpi@vger.kernel.org
Link: https://lkml.kernel.org/r/CAE9FiQVQx6FRXT-RdR7Crz4dg5LeUWHcUSy1KacjR+JgU_vGJg@mail.gmail.com
2016-10-08 12:10:52 +02:00
..
apei.c acpi, apei, ghes: Factor out ioremap virtual memory for IRQ and NMI context. 2014-07-22 15:05:06 -07:00
boot.c x86/acpi: Prevent LAPIC id 0xff from being accounted 2016-10-08 12:10:52 +02:00
cppc_msr.c ACPI / CPPC: Add support for functional fixed hardware address 2016-09-08 23:02:14 +02:00
cstate.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
Makefile ACPI / CPPC: Add support for functional fixed hardware address 2016-09-08 23:02:14 +02:00
sleep.c x86/asm/head: Rename 'stack_start' -> 'initial_stack' 2016-08-18 18:41:29 +02:00
sleep.h ACPICA: Cleanup asmlinkage for ACPICA APIs. 2013-10-31 14:37:35 +01:00
wakeup_32.S x86: Load __USER_DS into DS/ES after resume 2015-06-22 14:40:03 +02:00
wakeup_64.S x86/asm/acpi: Create a stack frame in do_suspend_lowlevel() 2016-02-24 08:35:43 +01:00