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5697df7322
Instead of uart_handle_sysrq_char() use uart_prepare_sysrq_char() and uart_unlock_and_check_sysrq(). This will call handle_sysrq() without holding the port lock, which in turn let us drop the spin_trylock hack. Suggested-by: Johan Hovold <johan@kernel.org> Signed-off-by: Michael Walle <michael@walle.cc> Link: https://lore.kernel.org/r/20210512141255.18277-5-michael@walle.cc Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.