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b0583ab477
The function cpumf_pmu_add and cpumf_pmu_del call function perf_event_update_userpage(). This calls is obsolete, the calls add and delete a counter event. Counter events do not sample data and the event->rb member to access the sampling ring buffer is always NULL. The function perf_event_update_userpage() simply returns in this case. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by : Sumanth Korikkar <sumanthk@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.