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Currently, tree SRCU relies on the srcu_node structures being initialized at the same time that the srcu_struct itself is initialized, and thus use the initial grace-period sequence number as the initial value for the srcu_node structure's ->srcu_have_cbs[] and ->srcu_gp_seq_needed_exp fields. Although this has a high probability of also working when the srcu_node array is allocated and initialized at some random later time, it would be better to avoid leaving such things to chance. This commit therefore initializes these fields with 0x2, which is a recognizable invalid value. It then adds the required checks for this invalid value in order to avoid confusion on long-running kernels (especially those on 32-bit systems) that allocate and initialize srcu_node arrays late in life. Co-developed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com> Signed-off-by: Neeraj Upadhyay <quic_neeraju@quicinc.com> Signed-off-by: Paul E. McKenney <paulmck@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.