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IA64: SPARSEMEM_VMEMMAP 16K page size support

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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>
This commit is contained in:
Christoph Lameter
2007-10-16 01:24:15 -07:00
committed by Linus Torvalds
parent 0889eba5b3
commit ef229c5a5e
3 changed files with 15 additions and 0 deletions
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6
include/asm-ia64/pgtable.h
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@@ -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))