b7ff97925b
There is no need to restrict users from locking bpf_spin_lock in map values of inner maps. Each inner map lookup gets a unique reg->id assigned to the returned PTR_TO_MAP_VALUE which will be preserved after the NULL check. Distinct lookups into different inner map get unique IDs, and distinct lookups into same inner map also get unique IDs. Hence, lift the restriction by removing the check return -ENOTSUPP in map_in_map.c. Later commits will add comprehensive test cases to ensure that invalid cases are rejected. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20221118015614.2013203-11-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 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.