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Commit 215c3409 authored by Andy Whitcroft's avatar Andy Whitcroft Committed by Linus Torvalds
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[PATCH] i386 sparsemem for single node systems 



Allow SPARSEMEM to be enabled on non-numa x86 systems.  This is made
dependant on EXPERIMENTAL also being set.  When an in-tree user (such as
simulated numa) exists it should be made dependant on that.

The plan is to have no options and no selector as normal when
!EXPERIMENTAL.  When EXPERIMENTAL we enable the FLATMEM and SPARSEMEM
options for X86_PC whilst maintaining DISCONTIGMEM and SPARSEMEM for NUMA.

Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent bb152f53

arch/i386/Kconfig

+6 −2
Original line number Diff line number Diff line
@@ -464,7 +464,6 @@ config NUMA 
	depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))

	default n if X86_PC

	default y if (X86_NUMAQ || X86_SUMMIT)

	select SPARSEMEM_STATIC



# Need comments to help the hapless user trying to turn on NUMA support

comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
@@ -493,6 +492,10 @@ config HAVE_ARCH_ALLOC_REMAP 
	depends on NUMA

	default y



config ARCH_FLATMEM_ENABLE

	def_bool y

	depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC)



config ARCH_DISCONTIGMEM_ENABLE

	def_bool y

	depends on NUMA
@@ -503,7 +506,8 @@ config ARCH_DISCONTIGMEM_DEFAULT 


config ARCH_SPARSEMEM_ENABLE

	def_bool y

	depends on NUMA

	depends on (NUMA || (X86_PC && EXPERIMENTAL))

	select SPARSEMEM_STATIC



config ARCH_SELECT_MEMORY_MODEL

	def_bool y

arch/i386/kernel/setup.c

+8 −0
Original line number Diff line number Diff line
@@ -954,6 +954,12 @@ efi_find_max_pfn(unsigned long start, unsigned long end, void *arg) 
	return 0;

}



static int __init

efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)

{

	memory_present(0, start, end);

	return 0;

}



/*

 * Find the highest page frame number we have available
@@ -965,6 +971,7 @@ void __init find_max_pfn(void) 
	max_pfn = 0;

	if (efi_enabled) {

		efi_memmap_walk(efi_find_max_pfn, &max_pfn);

		efi_memmap_walk(efi_memory_present_wrapper, NULL);

		return;

	}
@@ -979,6 +986,7 @@ void __init find_max_pfn(void) 
			continue;

		if (end > max_pfn)

			max_pfn = end;

		memory_present(0, start, end);

	}

}