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This patch is a major rewrite of the tasklet routines in rxe_task.c. The main motivation for this is the realization that the code violates the safety of the qp pointer by correct reference counting. When a tasklet is scheduled from a verbs API the calling thread has a valid reference to the qp and schedules the tasklet to run at a later time carrying a pointer to the qp. Once the calling code returns however the qp can be destroyed at any time. In order to correct this a reference to the qp must be taken when the task is scheduled and held until it finishes running. This is complicated by the tasklet library not alwys running a task that is scheduled depending on whether someone else has scheduled it. This patch moves the logic for deciding whether to run or schedule a task outside of do_task() and guarantees that there is only one copy of the task scheduled or running at a time. Secondly the separate flags controlling teardown and draining of the task are included in the task state machine and all references to the state are protected by spinlocks to avoid consistency and memory barrier issues. Link: https://lore.kernel.org/r/20230304174533.11296-9-rpearsonhpe@gmail.com Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> |
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| README | ||
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.