From: Geoff Levand Date: Tue, 18 Dec 2007 00:19:53 +0000 (-0800) Subject: sparsemem: make SPARSEMEM_VMEMMAP selectable X-Git-Tag: v2.6.24-rc6~47 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=a5ee6daa525c04079baee6f393c0b2dab3f61253;p=linux-2.6-omap-h63xx.git 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: Miguel Botón Signed-off-by: Geoff Levand Acked-by: Yasunori Goto Cc: Christoph Lameter Cc: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/Kconfig b/mm/Kconfig index c070ec0c15b..9ef97417a0b 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -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