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Prepare for the sched_class::switch*() methods getting folded into the change pattern. As a result of that, the location of switched_from will change slightly. SCHED_DEADLINE is affected by this change in location: OLD NEW | | switching_from() dequeue_task(); | dequeue_task() put_prev_task(); | put_prev_task() | switched_from() | ... change task ... | ... change task ... | switching_to(); | switching_to() enqueue_task(); | enqueue_task() set_next_task(); | set_next_task() prev_class->switched_from() | switched_to() | switched_to() | Notably, where switched_from() was called *after* the change to the task, it will get called before it. Specifically, switched_from_dl() uses dl_task(p) which uses p->prio; which is changed when switching class (it might be the reason to switch class in case of PI). When switched_from_dl() gets called, the task will have left the deadline class and dl_task() must be false, while when doing dequeue_dl_entity() the task must be a dl_task(), otherwise we'd have called a different dequeue method. Reported-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.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 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.