7ae731a844
We recently introduced a bug when we tried to convert of_iomap() to devm_of_iomap(). The problem was that there were two drivers mapping the same io region. The first driver was using of_iomap() and the second driver was using devm_of_iomap() and the kernel booted fine. When we converted the first drive to use devm_of_iomap() then the second driver failed with -EBUSY and the kernel couldn't boot. Let's add a comment to prevent this sort of mistake in the future. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20200609104642.GA43074@mwanda Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.