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Add udelay() function, inserts a delay based on microseconds with busy waiting, in preparation for supporting read_poll_timeout_atomic(). Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Acked-by: Andreas Hindborg <a.hindborg@kernel.org> Link: https://patch.msgid.link/20251103112958.2961517-2-fujita.tomonori@gmail.com Signed-off-by: Danilo Krummrich <dakr@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 reStructuredText 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.