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authorChristoph Lameter <clameter@sgi.com>2007-10-16 01:24:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:51 -0700
commitef229c5a5e7701ab08a6a06258f415b150348bcc (patch)
tree606a128b3408ca39b95e1bdd93ad17dd2a9d9f33 /include/asm-ia64
parent0889eba5b38f66d7d892a167d88284daddd3d43b (diff)
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 <clameter@sgi.com> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-ia64')
-rw-r--r--include/asm-ia64/pgtable.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h
index de6d01e24dd..6b4216edbb9 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))