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[ 0.000000] ioremap() called early from find_legacy_serial_ports+0x3cc/0x474. Use early_ioremap() instead find_legacy_serial_ports() is called early from setup_arch(), before paging_init(). vmalloc is not available yet, ioremap shouldn't be used that early. Use early_ioremap() and switch to a regular ioremap() later. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/103ed8ee9e5973c958ec1da2d0b0764f69395d01.1618925560.git.christophe.leroy@csgroup.eu
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.