Kumar Kartikeya Dwivedi
f2ac0e5d1c
Convert the percpu_freelist.c code to use rqspinlock, and remove the extralist fallback and trylock-based acquisitions to avoid deadlocks. Key thing to note is the retained while (true) loop to search through other CPUs when failing to push a node due to locking errors. This retains the behavior of the old code, where it would keep trying until it would be able to successfully push the node back into the freelist of a CPU. Technically, we should start iteration for this loop from raw_smp_processor_id() + 1, but to avoid hitting the edge of nr_cpus, we skip execution in the loop body instead. Closes: https://lore.kernel.org/bpf/CAPPBnEa1_pZ6W24+WwtcNFvTUHTHO7KUmzEbOcMqxp+m2o15qQ@mail.gmail.com Closes: https://lore.kernel.org/bpf/CAPPBnEYm+9zduStsZaDnq93q1jPLqO-PiKX9jy0MuL8LCXmCrQ@mail.gmail.com Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20250316040541.108729-21-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@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.