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Standard integer promotion is already done and %hx and %hhx is useless so do not encourage the use of %hh[xudi] or %h[xudi]. As Linus said in: https://lore.kernel.org/lkml/CAHk-=wgoxnmsj8GEVFJSvTwdnWm8wVJthefNk2n6+4TC=20e0Q@mail.gmail.com/ It's a pointless warning, making for more complex code, and making people remember esoteric printf format details that have no reason for existing. The "h" and "hh" things should never be used. The only reason for them being used if if you have an "int", but you want to print it out as a "char" (and honestly, that is a really bad reason, you'd be better off just using a proper cast to make the code more obvious). So if what you have a "char" (or unsigned char) you should always just print it out as an "int", knowing that the compiler already did the proper type conversion. Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Louis Taylor <louis@kragniz.eu> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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.