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authorGregory Fong <gregory.0xf0@gmail.com>2020-05-22 17:12:30 +0300
committerRussell King <rmk+kernel@armlinux.org.uk>2020-05-26 14:46:51 +0300
commitfb597f2a393294f3d3012ecb314f43b60fa48359 (patch)
tree1c56186856def2368ee6ad9763aa3f0da629b566 /Documentation/driver-api/gpio
parent98f3f7e51338db90f88940d99d9384a2855cc317 (diff)
downloadlinux-fb597f2a393294f3d3012ecb314f43b60fa48359.tar.xz
ARM: 8980/1: Allow either FLATMEM or SPARSEMEM on the multiplatform build
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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