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Commit a5ee6daa authored by Geoff Levand's avatar Geoff Levand Committed by Linus Torvalds
Browse files

sparsemem: make SPARSEMEM_VMEMMAP selectable 



SPARSEMEM_VMEMMAP needs to be a selectable config option to support
building the kernel both with and without sparsemem vmemmap support.  This
selection is desirable for platforms which could be configured one way for
platform specific builds and the other for multi-platform builds.

Signed-off-by: default avatarMiguel Botón <mboton@gmail.com>
Signed-off-by: default avatarGeoff Levand <geoffrey.levand@am.sony.com>
Acked-by: default avatarYasunori Goto <y-goto@jp.fujitsu.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2e12a7fb

mm/Kconfig

+7 −8
Original line number Diff line number Diff line
@@ -112,18 +112,17 @@ config SPARSEMEM_EXTREME 
	def_bool y

	depends on SPARSEMEM && !SPARSEMEM_STATIC



#

# SPARSEMEM_VMEMMAP uses a virtually mapped mem_map to optimise pfn_to_page

# and page_to_pfn.  The most efficient option where kernel virtual space is

# not under pressure.

#

config SPARSEMEM_VMEMMAP_ENABLE

	def_bool n



config SPARSEMEM_VMEMMAP

	bool

	depends on SPARSEMEM

	default y if (SPARSEMEM_VMEMMAP_ENABLE)

	bool "Sparse Memory virtual memmap"

	depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE

	default y

	help

	 SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise

	 pfn_to_page and page_to_pfn operations.  This is the most

	 efficient option when sufficient kernel resources are available.



# eventually, we can have this option just 'select SPARSEMEM'

config MEMORY_HOTPLUG