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4b08d9e24f
Provide functions that are related to the safe handover mechanism and allow console drivers to dynamically specify unsafe regions: - nbcon_context_can_proceed() Invoked by a console owner to check whether a handover request is pending or whether the console has been taken over by another context. If a handover request is pending, this function will also perform the handover, thus cancelling its own ownership. - nbcon_context_enter_unsafe()/nbcon_context_exit_unsafe() Invoked by a console owner to denote that the driver is about to enter or leave a critical region where a take over is unsafe. The exit variant is the point where the current owner releases the lock for a higher priority context which asked for the friendly handover. The unsafe state is stored in the console state and allows a new context to make informed decisions whether to attempt a takeover of such a console. The unsafe state is also available to the driver so that it can make informed decisions about the required actions and possibly take a special emergency path. Co-developed-by: John Ogness <john.ogness@linutronix.de> Signed-off-by: John Ogness <john.ogness@linutronix.de> Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20230916192007.608398-6-john.ogness@linutronix.de |
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arch | ||
block | ||
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 | ||
.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 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.