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b7975c4869
During tasks iteration, the locks can be dropped using scx_task_iter_unlock() to perform e.g. sleepable allocations. Afterwards, scx_task_iter_relock() has to be called prior to other iteration operations, which is error-prone. This can be easily automated by tracking whether scx_tasks_lock is held in scx_task_iter and re-acquiring when necessary. It already tracks whether the task's rq is locked after all. - Add scx_task_iter->list_locked which remembers whether scx_tasks_lock is held. - Rename scx_task_iter->locked to scx_task_iter->locked_task to better distinguish it from ->list_locked. - Replace scx_task_iter_relock() with __scx_task_iter_maybe_relock() which is automatically called by scx_task_iter_next() and scx_task_iter_stop(). - Drop explicit scx_task_iter_relock() calls. The resulting behavior should be equivalent. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Andrea Righi <arighi@nvidia.com> |
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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.