diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2016-10-07 14:02:12 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-10-08 12:10:52 +0200 |
| commit | f3bf1dbe64b62a2058dd1944c00990df203e8e7a (patch) | |
| tree | 607576d72492d18ff6118fae11a63c6929c42067 /arch | |
| parent | 2a51fe083eba7f99cbda72f5ef90cdf2f4df882c (diff) | |
| download | linux-f3bf1dbe64b62a2058dd1944c00990df203e8e7a.tar.gz linux-f3bf1dbe64b62a2058dd1944c00990df203e8e7a.tar.bz2 linux-f3bf1dbe64b62a2058dd1944c00990df203e8e7a.zip | |
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: 8f54969dc8d6 ("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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/acpi/boot.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 32a7d70913ac..8a5abaa7d453 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -233,6 +233,10 @@ acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end) acpi_table_print_madt_entry(header); + /* Ignore invalid ID */ + if (processor->id == 0xff) + return 0; + /* * We need to register disabled CPU as well to permit * counting disabled CPUs. This allows us to size |