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commit2c88d45edbupstream. Commit1340ccfa9a("x86,sched: Allow topologies where NUMA nodes share an LLC") added a vendor and model specific check to never call topology_sane() for Intel Skylake Server systems where NUMA nodes share an LLC. Intel Ice Lake and Sapphire Rapids CPUs also enumerate an LLC that is shared by multiple NUMA nodes. The LLC on these CPUs is shared for off-package data access but private to the NUMA node for on-package access. Rather than managing a list of allowable SNC topologies, make this SNC topology the default, and treat Intel's Cluster-On-Die (COD) topology as the exception. In SNC mode, Sky Lake, Ice Lake, and Sapphire Rapids servers do not emit this warning: sched: CPU #3's llc-sibling CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency. Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Alison Schofield <alison.schofield@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20210310190233.31752-1-alison.schofield@intel.com 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.