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ARMv7 chips with LPAE can often benefit from SPARSEMEM, as portions of system memory can be located deep in the 36-bit address space. Allow FLATMEM or SPARSEMEM to be selectable at compile time; FLATMEM remains the default. This is based on Kevin's "[PATCH 3/3] ARM: Allow either FLATMEM or SPARSEMEM on the multi-v7 build" from [1] and shamelessly rips off his commit message text above. As Arnd pointed out at [2] there doesn't seem to be any reason to tie this specifically to ARMv7, so this has been changed to apply to all multiplatform kernels. The addition of this option does not change the defaults and a build with any defconfig will behave the same way as previously. The only effect this change has is to enable user to change "Memory model" selection in interactive kernel configuration (menuconfig, xconfig etc). [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/286837.html [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/298950.html [ rppt: added ARCH_SELECT_MEMORY_MODEL and updated the changelog ] Cc: Kevin Cernekee <cernekee@gmail.com> Tested-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com> Signed-off-by: Doug Berger <opendmb@gmail.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> |
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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.