From: Christoph Lameter Date: Tue, 16 Oct 2007 08:24:15 +0000 (-0700) Subject: IA64: SPARSEMEM_VMEMMAP 16K page size support X-Git-Tag: v2.6.24-rc1~1244 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef229c5a5e7701ab08a6a06258f415b150348bcc;p=linux-2.6 IA64: SPARSEMEM_VMEMMAP 16K page size support Equip IA64 sparsemem with a virtual memmap. This is similar to the existing CONFIG_VIRTUAL_MEM_MAP functionality for DISCONTIGMEM. It uses a PAGE_SIZE mapping. This is provided as a minimally intrusive solution. We split the 128TB VMALLOC area into two 64TB areas and use one for the virtual memmap. This should replace CONFIG_VIRTUAL_MEM_MAP long term. [apw@shadowen.org: convert to new helper based initialisation] Signed-off-by: Christoph Lameter Signed-off-by: Andy Whitcroft Acked-by: Mel Gorman Cc: "Luck, Tony" Cc: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 2e6310b8ea..802b082e21 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -348,6 +348,7 @@ config ARCH_FLATMEM_ENABLE config ARCH_SPARSEMEM_ENABLE def_bool y depends on ARCH_DISCONTIGMEM_ENABLE + select SPARSEMEM_VMEMMAP_ENABLE config ARCH_DISCONTIGMEM_DEFAULT def_bool y if (IA64_SGI_SN2 || IA64_GENERIC || IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB) diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c index 0d34585058..5628067a74 100644 --- a/arch/ia64/mm/discontig.c +++ b/arch/ia64/mm/discontig.c @@ -715,3 +715,11 @@ void arch_refresh_nodedata(int update_node, pg_data_t *update_pgdat) scatter_node_data(); } #endif + +#ifdef CONFIG_SPARSEMEM_VMEMMAP +int __meminit vmemmap_populate(struct page *start_page, + unsigned long size, int node) +{ + return vmemmap_populate_basepages(start_page, size, node); +} +#endif diff --git a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h index de6d01e24d..6b4216edbb 100644 --- a/include/asm-ia64/pgtable.h +++ b/include/asm-ia64/pgtable.h @@ -236,8 +236,14 @@ ia64_phys_addr_valid (unsigned long addr) # define VMALLOC_END vmalloc_end extern unsigned long vmalloc_end; #else +#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_SPARSEMEM_VMEMMAP) +/* SPARSEMEM_VMEMMAP uses half of vmalloc... */ +# define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 10))) +# define vmemmap ((struct page *)VMALLOC_END) +#else # define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 9))) #endif +#endif /* fs/proc/kcore.c */ #define kc_vaddr_to_offset(v) ((v) - RGN_BASE(RGN_GATE))