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871185ace4
If CONFIG_NETFILTER_INGRESS is not enabled, nf_ingress() becomes a no-op because it solely contains an if-clause calling nf_hook_ingress_active(), for which an empty inline stub exists in <linux/netfilter_ingress.h>. All the symbols used in the if-clause's body are still available even if CONFIG_NETFILTER_INGRESS is not enabled. The additional "#ifdef CONFIG_NETFILTER_INGRESS" in nf_ingress() is thus unnecessary, so drop it. Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.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.