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877d5cd2ae
When echo an invalid val to scaling_min_freq: > echo 123abc123 > scaling_min_freq It looks weird to have a return val of 0: > echo $? > 0 Sane people won't echo strings like that into these interfaces but fuzz tests may do. Also, maybe it's better to inform people if input is invalid. After this: > echo 123abc123 > scaling_min_freq > -bash: echo: write error: Invalid argument Signed-off-by: qinyu <qinyu32@huawei.com> Tested-by: zhangxiaofeng <zhangxiaofeng46@huawei.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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.