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The intention behind kf_cpu_valid() was that when called from kfuncs, kf_cpu_valid() would be able to implicitly determine the scx_sched instance being operated on and thus wouldn't need @sch passed in explicitly. This turned out to be unnecessarily complicated to implement and not have justifiable practical benefits. Replace kf_cpu_valid() usages with ops_cpu_valid() which takes explicit @sch. Callers which don't have $sch available in the context are updated to read $scx_root under RCU read lock, verify that it's not NULL and pass it in. scx_bpf_cpu_rq() is restructured to use guard(rcu)() instead of explicit rcu_read_[un]lock(). Reviewed-by: Andrea Righi <arighi@nvidia.com> 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 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.