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Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>: This series handles the race which can result missing the first position update after the trace is enabled. In short: the firmware might send the position update (if we have enough trace data generated) after the dma-trace is enabled by the TRACE_DMA_PARAMS_EXT message. Depending on scheduling, load, preemption on Linux side we have seen that occasionally this first position update got missed and we missed reading it out. A new state and more strict handling of host_offset can overcome this issue, making the dtrace more reliable.
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.