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ebb6d30d9e
Certain configurations (e.g., systems that make heavy use of netns) need to use synchronize_rcu_expedited() to service RCU grace periods even after boot. Even though synchronize_rcu_expedited() has been traditionally considered harmful for RT for the heavy use of IPIs, it is perfectly usable under certain conditions (e.g. nohz_full). Make rcupdate.rcu_normal_after_boot= again writeable on RT (if NO_HZ_ FULL is defined), but keep its default value to 1 (enabled) to avoid regressions. Users who need synchronize_rcu_expedited() will boot with rcupdate.rcu_normal_after_ boot=0 in the kernel cmdline. Reflect the change in synchronize_rcu_expedited_wait() by removing the WARN related to CONFIG_PREEMPT_RT. Signed-off-by: Juri Lelli <juri.lelli@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.