34fb0e7034
Currently it is not detectable from within Linux when PCI instructions are retried because of a busy condition. Detecting such conditions and especially how long they lasted can however be quite useful in problem determination. This patch enables this by adding an s390dbf error log when a CC 2 is first encountered as well as after the retried instruction. Despite being unlikely it may be possible that these added debug messages drown out important other messages so allow setting the debug level in zpci_err_insn*() and set their level to 1 so they can be filtered out if need be. Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.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.