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698f744aa8
copy_from_user might sleep so we can never call it when we have a spinlock. Moreover, it is not necessary in waiting for user interrupt, because if multiple threads will call this function on the same interrupt, each one will have it's own fence object inside the driver. The user address might be the same, but it doesn't really matter to us, as we only read from it. Signed-off-by: Oded Gabbay <ogabbay@kernel.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.