Commit-ID: f3bf1dbe64b62a2058dd1944c00990df203e8e7a
Gitweb: http://git.kernel.org/tip/f3bf1dbe64b62a2058dd1944c00990df203e8e7a
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Fri, 7 Oct 2016 14:02:12 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 8 Oct 2016 12:10:52 +0200
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@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>,
Cc: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Cc: douly.fnst@xxxxxxxxxxxxxx,
Cc: zhugh.fnst@xxxxxxxxxxxxxx
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Lv Zheng <lv.zheng@xxxxxxxxx>,
Cc: robert.moore@xxxxxxxxx
Cc: linux-acpi@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/CAE9FiQVQx6FRXT-RdR7Crz4dg5LeUWHcUSy1KacjR+JgU_vGJg@xxxxxxxxxxxxxx
---
arch/x86/kernel/acpi/boot.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 32a7d70..8a5abaa 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
--
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