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Reserve 129th region in the memblock, and this will trigger the memblock_double_array() function, this needs valid memory regions. So using dummy_physical_memory_init() to allocate a valid memory region. At the same time, reserve 128 faked memory region, and make sure these reserved region not intersect with the valid memory region. So memblock_double_array() will choose the valid memory region, and it will success. Also need to restore the reserved.regions after memblock_double_array(), to make sure the subsequent tests can run as normal. Signed-off-by: Shaoqin Huang <shaoqin.huang@intel.com> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Link: https://lore.kernel.org/r/20221011062128.49359-3-shaoqin.huang@intel.com
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.