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A sequence counter write section must be serialized or its internal state can get corrupted. A plain seqcount_t does not contain the information of which lock must be held to guaranteee write side serialization. For xfrm_state_hash_generation, use seqcount_spinlock_t instead of plain seqcount_t. This allows to associate the spinlock used for write serialization with the sequence counter. It thus enables lockdep to verify that the write serialization lock is indeed held before entering the sequence counter write section. If lockdep is disabled, this lock association is compiled out and has neither storage size nor runtime overhead. Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.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 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.