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d8dcc2d8d9
Till now memcpy() relies on memmove(), but it's always included for libgcc, so we have a larger than needed function. Let's implement two unidirectional variants to copy from bottom to top and from top to bottom, and use the former for memcpy(). The variants are optimized to be compact, and at the same time the compiler is sometimes able to detect the loop and to replace it with a "rep movsb". The new function is 24 bytes instead of 52 on x86_64. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@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.