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The flow for processing ssch requests can be improved by splitting the BUSY state: - CP_PROCESSING: We reject any user space requests while we are in the process of translating a channel program and submitting it to the hardware. Use -EAGAIN to signal user space that it should retry the request. - CP_PENDING: We have successfully submitted a request with ssch and are now expecting an interrupt. As we can't handle more than one channel program being processed, reject any further requests with -EBUSY. A final interrupt will move us out of this state. By making this a separate state, we make it possible to issue a halt or a clear while we're still waiting for the final interrupt for the ssch (in a follow-on patch). It also makes a lot of sense not to preemptively filter out writes to the io_region if we're in an incorrect state: the state machine will handle this correctly. Reviewed-by: Eric Farman <farman@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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.