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[ Upstream commit 9a039eeb71a42c8b13408a1976e300f3898e1be0 ] `ip_hdr(skb)->ihl << 2` is the same as `ip_hdrlen(skb)` Therefore, we should use a well-defined function not a bit shift to find the header length. It also compresses two lines to a single line. Signed-off-by: Moon Yeounsu <yyyynoom@gmail.com> Reviewed-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@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.