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arm64: add ARM64-specific support for flatmem

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Flatmem is useful in reducing kernel memory usage.
One usecase is in kdump kernel. We are able to save
~14M by moving to flatmem scheme.

Cc: xe-kernel@external.cisco.com
Cc: Nikunj Kela <nkela@cisco.com>
Signed-off-by: Nikunj Kela <nkela@cisco.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Nikunj Kela 2018-07-06 10:47:24 -07:00 committed by Will Deacon
parent d7c7118caf
commit e7d4bac428
1 changed files with 3 additions and 0 deletions
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arch/arm64/Kconfig
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@ -786,6 +786,9 @@ config ARCH_SPARSEMEM_DEFAULT
config ARCH_SELECT_MEMORY_MODEL
def_bool ARCH_SPARSEMEM_ENABLE
config ARCH_FLATMEM_ENABLE
def_bool y
config HAVE_ARCH_PFN_VALID
def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM