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When s2[i] = '\0', if s1[i] != '\0', it will be judged by ret, and if s1[i] = '\0', it will be judegd by !s1[i]. So in reality, s2 [i] will never make a judgment Signed-off-by: Feng Yang <yangfeng@kylinos.cn> Reviewed-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/20250314031013.94480-1-yangfeng59949@163.com Signed-off-by: Namhyung Kim <namhyung@kernel.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.