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When debug level is set to `ACPI_LV_TRACE_POINT` method start and
exit are emitted into the debug logs. This can be useful to understand
call paths, however none of the arguments for the method calls are
populated even when turning up other debug levels.
This can be useful for BIOSes that contain debug strings to see those
strings. When `ACPI_LV_TRACE_POINT` is set also output all of the arguments
for a given method call.
This enables this type of debugging:
```
extrace-0138 ex_trace_point : Method Begin [0x0000000096b240c4:\M460] execution.
extrace-0173 ex_trace_args : " POST CODE: %X ACPI TIMER: %X TIME: %d.%d ms\n", b0003f53, 1a26a8b2, 0, 15e, 0, 0
extrace-0138 ex_trace_point : Method End [0x0000000096b240c4:\M460] execution.
```
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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 reStructuredText 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.