mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-01-19 12:55:08 +00:00
00a134fc2b
The pm-cps code has up until now used per-CPU variables indexed by core, rather than CPU number, in order to share data amongst sibling CPUs (ie. VPs/threads in a core). This works fine for single cluster systems, but with multi-cluster systems a core number is no longer unique in the system, leading to sharing between CPUs that are not actually siblings. Avoid this issue by using per-CPU variables as they are more generally used - ie. access them using CPU numbers rather than core numbers. Sharing between siblings is then accomplished by: - Assigning the same pointer to entries for each sibling CPU for the nc_asm_enter & ready_count variables, which allow this by virtue of being per-CPU pointers. - Indexing by the first CPU set in a CPUs cpu_sibling_map in the case of pm_barrier, for which we can't use the previous approach because the per-CPU variable is not a pointer. Signed-off-by: Paul Burton <paulburton@kernel.org> Signed-off-by: Dragan Mladjenovic <dragan.mladjenovic@syrmia.com> Signed-off-by: Aleksandar Rikalo <arikalo@gmail.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Tested-by: Gregory CLEMENT <gregory.clement@bootlin.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.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 reStructuredText 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.