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powerpc is the only platform that do not rely on cpu_up()->try_online_node() to bring up a numa node, and special cases it, instead, deep in its own machinery: dlpar_online_cpu find_and_online_cpu_nid try_online_node This should not be needed, but the thing is that the try_online_node() from cpu_up() will not apply on the right node, because cpu_to_node() will return the old mapping numa<->cpu that gets set on boot stage for all possible cpus. That can be seen easily if we try to print out the numa node passed to try_online_node() in cpu_up(). The thing is that the numa<->cpu mapping does not get updated till a much later stage in start_secondary: start_secondary: set_numa_node(numa_cpu_lookup_table[cpu]) But we do not really care, as we already now the CPU <-> NUMA associativity back in find_and_online_cpu_nid(), so let us make use of that and set the proper numa<->cpu mapping, so cpu_to_node() in cpu_up() returns the right node and try_online_node() can do its work. Signed-off-by: Oscar Salvador <osalvador@suse.de> Tested-by: Geetika Moolchandani <Geetika.Moolchandani1@ibm.com> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220411074934.4632-1-osalvador@suse.de
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.