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470a072e12
It is better to use perror() only if errno is not 0, it should use printf() when errno is 0, otherwise there exists redudant ": Success". E.g. without this patch: $ ./spidev_test -p 1234 --input test.bin only one of -p and --input may be selected: Success Aborted (core dumped) With this patch: $ ./spidev_test -p 1234 --input test.bin only one of -p and --input may be selected Aborted (core dumped) Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/1581567368-8055-3-git-send-email-yangtiezhu@loongson.cn Signed-off-by: Mark Brown <broonie@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 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.