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096b256c9a
Running this kunit test with lockdep enabled leads to warning splats about calling clk provider APIs without the clk_prepare lock held. I proposed adding a wrapper around these APIs to grab the prepare lock so we can call them from anywhere, and Maxime implemented that approach[1], but it didn't look great. That's because we had to make more kunit testing APIs just to call code from a place that isn't a clk provider when the prepare lock isn't held. Instead of doing that, let's implement a determine_rate clk_op for a new leaf clk that is the child of the existing leaf clk. We can call __clk_determine_rate() on the existing leaf clk from there, and stash away the clk_rate_request struct to check once the clk_op returns. Drive that clk_op by calling clk_round_rate() to keep things similar to how it was before (i.e. nothing actually changes rate, just the new rate is determined). This silences the warning by driving the test from a clk_op where we know the prepare lock is held. While looking at this in more detail, it was determined that the code we intended to test in commit |
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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 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.