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Sean Christopherson
45af1bb99b
Move the WARN sanity checks out of the PI descriptor update loop so as not to spam the kernel log if the condition is violated and the update takes multiple attempts due to another writer. This also eliminates a few extra uops from the retry path. Technically not checking every attempt could mean KVM will now fail to WARN in a scenario that would have failed before, but any such failure would be inherently racy as some other agent (CPU or device) would have to concurrent modify the PI descriptor. Add a helper to handle the actual write and more importantly to document why the write may need to be retried. Signed-off-by: Sean Christopherson <[email protected]> Message-Id: <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
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.