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stddef.h for NULL
The header uses `NULL` in both `CONFIG_KUNIT=y` and `=n` cases, but does not include it explicitly. When `CONFIG_KUNIT=y`, the header is already getting included via the other headers, so it is not a problem for users. However, when `CONFIG_KUNIT=n`, it is not, and thus a user could hit a build error when including `kunit/test-bug.h`, like we are doing later in this series [1]. Thus include `linux/stddef.h`, and do so outside the `#if`, since it is used in both cases. Reported-by: Boqun Feng <boqun.feng@gmail.com> Closes: https://lore.kernel.org/rust-for-linux/ZJ8cNUW3oR2p+gL1@boqun-archlinux/ [1] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Reviewed-by: David Gow <davidgow@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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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.
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