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commita74fabfbd1upstream. ACPI 6.3 introduced the online capable bit, and also introduced MADT version 5. Latter was used to distinguish whether the offset storing online capable could be used. However ACPI 6.2b has MADT version "45" which is for an errata version of the ACPI 6.2 spec. This means that the Linux code for detecting availability of MADT will mistakenly flag ACPI 6.2b as supporting online capable which is inaccurate as it's an ACPI 6.3 feature. Instead use the FADT major and minor revision fields to distinguish this. [ bp: Massage. ] Fixes:aa06e20f1b("x86/ACPI: Don't add CPUs that are not online capable") Reported-by: Eric DeVolder <eric.devolder@oracle.com> Reported-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Cc: <stable@kernel.org> Link: https://lore.kernel.org/r/943d2445-84df-d939-f578-5d8240d342cc@unsolicited.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.