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| author |  Kishon Vijay Abraham I <kvijayab@amd.com>
| 2023-01-05 04:10:59 +0000 |
|---|---|---|
| committer |  Borislav Petkov (AMD) <bp@alien8.de>
| 2023-01-10 19:21:07 +0100 |
| commit | e2869bd7af608c343988429ceb1c2fe99644a01f (patch) | |
| tree | 6bb771b87bd94e12519b752fe1a6fcba700e470d /arch/x86/boot | |
| parent | scripts/head-object-list: Remove x86 from the list (diff) | |
| download | linux-e2869bd7af608c343988429ceb1c2fe99644a01f.tar.gz linux-e2869bd7af608c343988429ceb1c2fe99644a01f.tar.bz2 linux-e2869bd7af608c343988429ceb1c2fe99644a01f.zip | |
x86/acpi/boot: Do not register processors that cannot be onlined for x2APIC
Section 5.2.12.12 Processor Local x2APIC Structure in the ACPI v6.5
spec mandates that both "enabled" and "online capable" Local APIC Flags
should be used to determine if the processor is usable or not.
However, Linux doesn't use the "online capable" flag for x2APIC to
determine if the processor is usable. As a result, cpu_possible_mask has
incorrect value and results in more memory getting allocated for per_cpu
variables than it is going to be used.
Make sure Linux parses both "enabled" and "online capable" flags for
x2APIC to correctly determine if the processor is usable.
Fixes: aa06e20f1be6 ("x86/ACPI: Don't add CPUs that are not online capable")
Reported-by: Leo Duran <leo.duran@amd.com>
Signed-off-by: Kishon Vijay Abraham I <kvijayab@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20230105041059.39366-1-kvijayab@amd.com
Diffstat (limited to 'arch/x86/boot')
0 files changed, 0 insertions, 0 deletions