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ARM: 8980/1: Allow either FLATMEM or SPARSEMEM on the multiplatform build

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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>
This commit is contained in:
Gregory Fong 2020-05-22 15:12:30 +01:00 committed by Russell King
parent 98f3f7e513
commit fb597f2a39
1 changed files with 10 additions and 1 deletions
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11
arch/arm/Kconfig
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@ -312,6 +312,9 @@ choice
config ARCH_MULTIPLATFORM
bool "Allow multiple platforms to be selected"
depends on MMU
select ARCH_FLATMEM_ENABLE
select ARCH_SPARSEMEM_ENABLE
select ARCH_SELECT_MEMORY_MODEL
select ARM_HAS_SG_CHAIN
select ARM_PATCH_PHYS_VIRT
select AUTO_ZRELADDR
@ -1515,9 +1518,15 @@ config OABI_COMPAT
config ARCH_HAS_HOLES_MEMORYMODEL
bool
config ARCH_SELECT_MEMORY_MODEL
bool
config ARCH_FLATMEM_ENABLE
bool
config ARCH_SPARSEMEM_ENABLE
bool
select SPARSEMEM_STATIC
select SPARSEMEM_STATIC if SPARSEMEM
config HAVE_ARCH_PFN_VALID
def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM