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Kuniyuki Iwashima says: ==================== af_unix: Remove spin_lock_nested() and convert to lock_cmp_fn. This series removes spin_lock_nested() in AF_UNIX and instead defines the locking orders as functions tied to each lock by lockdep_set_lock_cmp_fn(). When the defined function returns a negative value, lockdep considers it will not cause deadlock. (See ->cmp_fn() in check_deadlock() and check_prev_add().) When we cannot define the total ordering, we return -1 for the allowed ordering and otherwise 0 as undefined. [0] [0]: https://lore.kernel.org/netdev/thzkgbuwuo3knevpipu4rzsh5qgmwhklihypdgziiruabvh46f@uwdkpcfxgloo/ Changes: v4: * Patch 4 * Make unix_state_lock_cmp_fn() symmetric. v3: https://lore.kernel.org/netdev/20240614200715.93150-1-kuniyu@amazon.com/ * Patch 3 * Cache sk->sk_state * s/unix_state_lock()/unix_state_unlock()/ * Patch 8 * Add embryo -> listener locking order v2: https://lore.kernel.org/netdev/20240611222905.34695-1-kuniyu@amazon.com/ * Patch 1 & 2 * Use (((l) > (r)) - ((l) < (r))) for comparison v1: https://lore.kernel.org/netdev/20240610223501.73191-1-kuniyu@amazon.com/ ==================== Link: https://lore.kernel.org/r/20240620205623.60139-1-kuniyu@amazon.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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.