1f306ecbe0
This patch converts spin_[lock|unlock] functions of pin bank to raw_spinlock to support preempt-rt. This can avoid BUG() assertion when irqchip callbacks are triggerred. Spinlocks can be converted rt_mutex which is preemptible when we apply preempt-rt patches. According to "Documentation/driver-api/gpio/driver.rst", "Realtime considerations: a realtime compliant GPIO driver should not use spinlock_t or any sleepable APIs (like PM runtime) as part of its irqchip implementation. - spinlock_t should be replaced with raw_spinlock_t.[1] " Cc: Tomasz Figa <tomasz.figa@gmail.com> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Sylwester Nawrocki <s.nawrocki@samsung.com> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Chanho Park <chanho61.park@samsung.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20210121030009.25673-1-chanho61.park@samsung.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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.