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The si_sys_private member of the siginfo which is embedded in the preallocated sigqueue is used by the posix timer code to decide whether a timer must be reprogrammed on signal delivery. The handling of this is racy as a long standing comment in that code documents. It is modified with the timer lock held, but without sighand lock being held. The actual signal delivery code checks for it under sighand lock without holding the timer lock. Hand the new value to send_sigqueue() as argument and store it with sighand lock held. This is an intermediate change to address this issue. The arguments to this function will be cleanup in subsequent changes. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/all/20241001083835.434338954@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 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.