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3d50503b3b
There are two modes for mailbox command (cmd) queue, i.e., event mode and poll mode. For each mode, we use corresponding semaphores to protect the cmd queue resource competition, so called event_sem and poll_sem. During cmd init, both semaphores are initialized and poll mode is selected. Thus, there is no need to up poll_sema again in cmd_use_polling. Furthermore, there is no need to down the sema of the other side while switching mode. This patch aims to decouple the switch between event mode and poll mode of cmd. Link: https://lore.kernel.org/r/1567068102-56919-2-git-send-email-liweihang@hisilicon.com Signed-off-by: Yixian Liu <liuyixian@huawei.com> Signed-off-by: Weihang Li <liweihang@hisilicon.com> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.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.