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[ Upstream commit7d8ed162e6] commit6a9531c3a8("memblock: fix crash when reserved memory is not added to memory") introduce the usage of early_pfn_to_nid, which is not defined in memblock tests. The original definition of early_pfn_to_nid is defined in mm.h, so let add this in the corresponding mm.h. Signed-off-by: Wei Yang <richard.weiyang@gmail.com> CC: Yajun Deng <yajun.deng@linux.dev> CC: Mike Rapoport <rppt@kernel.org> Link: https://lore.kernel.org/r/20240402132701.29744-2-richard.weiyang@gmail.com Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> Signed-off-by: Sasha Levin <sashal@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 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.