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authorJames Morse <james.morse@arm.com>2018-08-31 16:19:43 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2018-09-21 12:02:45 +0100
commit8a695a5873339c2e7c746ee51e3774fedd07d0a9 (patch)
treed1ed0a79656a81836bebcd49ba116c4f62e9a215 /arch/arm64/Kconfig
parentarm64/cpufeatures: Emulate MRS instructions by parsing ESR_ELx.ISS (diff)
downloadlinux-dev-8a695a5873339c2e7c746ee51e3774fedd07d0a9.tar.xz
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arm64: Kconfig: Remove ARCH_HAS_HOLES_MEMORYMODEL
include/linux/mmzone.h describes ARCH_HAS_HOLES_MEMORYMODEL as relevant when parts the memmap have been free()d. This would happen on systems where memory is smaller than a sparsemem-section, and the extra struct pages are expensive. pfn_valid() on these systems returns true for the whole sparsemem-section, so an extra memmap_valid_within() check is needed. On arm64 we have nomap memory, so always provide pfn_valid() to test for nomap pages. This means ARCH_HAS_HOLES_MEMORYMODEL's extra checks are already rolled up into pfn_valid(). Remove it. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to '')
-rw-r--r--arch/arm64/Kconfig5
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index fabac617d605..da5e6f085561 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -771,9 +771,6 @@ source kernel/Kconfig.hz
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
def_bool y
-config ARCH_HAS_HOLES_MEMORYMODEL
- def_bool y if SPARSEMEM
-
config ARCH_SPARSEMEM_ENABLE
def_bool y
select SPARSEMEM_VMEMMAP_ENABLE
@@ -788,7 +785,7 @@ config ARCH_FLATMEM_ENABLE
def_bool !NUMA
config HAVE_ARCH_PFN_VALID
- def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
+ def_bool y
config HW_PERF_EVENTS
def_bool y