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b93ddc4f91The reserved_end variable had been used by the bootmem_init() code to find a lowest limit of memory available for memmap blob. The original code just tried to find a free memory space higher than kernel was placed. This limitation seems justified for the memmap ragion search process, but I can't see any obvious reason to reserve the unused space below kernel seeing some platforms place it much higher than standard 1MB. Moreover the RELOCATION config enables it to be loaded at any memory address. So lets reserve the memory occupied by the kernel only, leaving the region below being free for allocations. After doing this we can now discard the code freeing a space between kernel _text and VMLINUX_LOAD_ADDRESS symbols since it's going to be free anyway (unless marked as reserved by platforms). Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Matt Redfearn <matt.redfearn@mips.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Thomas Bogendoerfer <tbogendoerfer@suse.de> Cc: Huacai Chen <chenhc@lemote.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Juergen Gross <jgross@suse.com> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org |
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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.