025e168458
While wq_pod_type[] can now group CPUs in any aribitrary way, WQ_AFFN_NUM init is hard coded into workqueue_init_topology(). This patch modularizes the init path by introducing init_pod_type() which takes a callback to determine whether two CPUs should share a pod as an argument. init_pod_type() first scans the CPU combinations testing for sharing to assign consecutive pod IDs and initialize pod_type->cpu_pod[]. Once ->cpu_pod[] is determined, ->pod_cpus[] and ->pod_node[] are initialized accordingly. WQ_AFFN_NUMA is now initialized by calling init_pod_type() with cpus_share_numa() which tests whether the CPU belongs to the same NUMA node. This patch may change the pod ID assigned to each NUMA node but that shouldn't cause any behavior changes as the NUMA node to use for allocations are tracked separately in pod_type->pod_node[]. This makes adding new affinty types pretty easy. Signed-off-by: Tejun Heo <tj@kernel.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.