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Since ownership can be lost at any time due to handover or takeover, a printing context _must_ be prepared to back out immediately and carefully. However, there are scenarios where the printing context must reacquire ownership in order to finalize or revert hardware changes. One such example is when interrupts are disabled during printing. No other context will automagically re-enable the interrupts. For this case, the disabling context _must_ reacquire nbcon ownership so that it can re-enable the interrupts. Provide nbcon_reacquire_nobuf() for exactly this purpose. It allows a printing context to reacquire ownership using the same priority as its previous ownership. Note that after a successful reacquire the printing context will have no output buffer because that has been lost. This function cannot be used to resume printing. Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20240904120536.115780-2-john.ogness@linutronix.de Signed-off-by: Petr Mladek <pmladek@suse.com> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| 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 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.