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arm64: Kconfig: Remove ARCH_HAS_HOLES_MEMORYMODEL

Browse source 
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>
This commit is contained in:
James Morse 2018-08-31 16:19:43 +01:00 committed by Catalin Marinas
parent 21f8479617
commit 8a695a5873
3 changed files with 1 additions and 8 deletions
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5
arch/arm64/Kconfig
View file

@ -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

2
arch/arm64/include/asm/page.h
View file

@ -37,9 +37,7 @@ extern void clear_page(void *to);
typedef struct page *pgtable_t;
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
extern int pfn_valid(unsigned long);
#endif
#include <asm/memory.h>

2
arch/arm64/mm/init.c
View file

@ -284,7 +284,6 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
#endif /* CONFIG_NUMA */
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
phys_addr_t addr = pfn << PAGE_SHIFT;
@ -294,7 +293,6 @@ int pfn_valid(unsigned long pfn)
return memblock_is_map_memory(addr);
}
EXPORT_SYMBOL(pfn_valid);
#endif
#ifndef CONFIG_SPARSEMEM
static void __init arm64_memory_present(void)