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The multi_cpu_stop() contains a loop that can initially be executed with interrupts enabled (in the MULTI_STOP_NONE and MULTI_STOP_PREPARE states). Interrupts are guaranteed to be once the MULTI_STOP_DISABLE_IRQ state is reached. Unfortunately, the rcu_momentary_eqs() function that is currently invoked on each pass through this loop requires that interrupts be disabled. This commit therefore moves this call to rcu_momentary_eqs() to the body of the "else if (curstate > MULTI_STOP_PREPARE)" portion of the loop, thus guaranteeing that interrupts will be disabled on each call, as required. Kudos to 朱恺乾 (Kaiqian) for noting that this had not made it to mainline. [ paulmck: Update from rcu_momentary_dyntick_idle() to rcu_momentary_eqs(). ] Link: https://lore.kernel.org/all/1712649736-27058-1-git-send-email-quic_mojha@quicinc.com/ Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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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.