e120e58ec2
apic::x86_32_early_logical_apicid() is yet another historical joke. It is used to preset the x86_cpu_to_logical_apicid per CPU variable during APIC enumeration with: - 1 shifted left by the CPU number - the physical APIC ID in case of bigsmp The latter is hillarious because bigsmp uses physical destination mode which never can use the logical APIC ID. It gets even worse. As bigsmp can be enforced late in the boot process the probe function overwrites the per CPU variable which is never used for this APIC type once again. Remove that gunk and store 1 << cpunr unconditionally if and only if the CPU number is less than 8, because the default logical destination mode only allows up to 8 CPUs. This is just an intermediate step before removing the per CPU insanity completely. Stay tuned. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Michael Kelley <mikelley@microsoft.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)
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.