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| author | James Morse <james.morse@arm.com> | 2018-08-31 16:19:43 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-09-21 12:02:45 +0100 |
| commit | 8a695a5873339c2e7c746ee51e3774fedd07d0a9 (patch) | |
| tree | d1ed0a79656a81836bebcd49ba116c4f62e9a215 /arch/arm64/Kconfig | |
| parent | 21f84796177443695680180a8493a9e20d254d5e (diff) | |
| download | lwn-8a695a5873339c2e7c746ee51e3774fedd07d0a9.tar.gz lwn-8a695a5873339c2e7c746ee51e3774fedd07d0a9.zip | |
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 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 5 |
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 |