dbca151cad
The comment where the bucket lock is acquired says: /* bpf_map_update_elem() can be called in_irq() */ which is not really helpful and aside of that it does not explain the subtle details of the hash bucket locks expecially in the context of BPF and perf, kprobes and tracing. Add a comment at the top of the file which explains the protection scopes and the details how potential deadlocks are prevented. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200224145642.755793061@linutronix.de
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.