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Replace `sr` with `Sr`. The condition `!tmp1 || rb_is_black(tmp1)` ensures that `tmp1` (which is `sibling->rb_right`) is either NULL or a black node. Therefore, the right child of the sibling must be black, and the example should use `Sr` instead of `sr`. Link: https://lkml.kernel.org/r/20250403112614.570140-1-johnny1001s000602@gmail.com Signed-off-by: Chisheng Chen <johnny1001s000602@gmail.com> Cc: Hsin Chang Yu <zxcvb600870024@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.