linux/arch/x86/kernel/acpi
Dou Liyang 10daf10ab1 x86/acpi: Prevent X2APIC id 0xffffffff from being accounted
RongQing reported that there are some X2APIC id 0xffffffff in his machine's
ACPI MADT table, which makes the number of possible CPU inaccurate.

The reason is that the ACPI X2APIC parser has no sanity check for APIC ID
0xffffffff, which is an invalid id in all APIC types. See "Intel® 64
Architecture x2APIC Specification", Chapter 2.4.1.

Add a sanity check to acpi_parse_x2apic() which ignores the invalid id.

Reported-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Cc: len.brown@intel.com
Cc: rjw@rjwysocki.net
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/20180412014052.25186-1-douly.fnst@cn.fujitsu.com
2018-04-17 11:56:31 +02:00
..
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
apei.c ACPI / APEI: Remove arch_apei_flush_tlb_one() 2017-11-07 12:13:38 +01:00
boot.c x86/acpi: Prevent X2APIC id 0xffffffff from being accounted 2018-04-17 11:56:31 +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/ACPI/cstate: Allow ACPI C1 FFH MWAIT use on AMD systems 2017-06-27 02:00:52 +02:00
sleep.c ACPI / PM: Make it possible to ignore the system sleep blacklist 2017-11-27 01:44:24 +01:00
sleep.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +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/suspend: fix false positive KASAN warning on suspend/resume 2016-12-06 02:22:44 +01:00