[IA64] Sparse virtual implementation
Equip IA64 sparsemem with a virtual memmap. This is similar to the existing
CONFIG_VMEMMAP functionality for discontig. 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.
Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]>
Index: linux-2.6.21-rc5-mm2/arch/ia64/Kconfig
===================================================================
--- linux-2.6.21-rc5-mm2.orig/arch/ia64/Kconfig 2007-04-02 16:15:29.000000000
-0700
+++ linux-2.6.21-rc5-mm2/arch/ia64/Kconfig 2007-04-02 16:15:50.000000000
-0700
@@ -350,6 +350,10 @@ config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on ARCH_DISCONTIGMEM_ENABLE
+config SPARSE_VIRTUAL
+ def_bool y
+ depends on ARCH_SPARSEMEM_ENABLE
+
config ARCH_DISCONTIGMEM_DEFAULT
def_bool y if (IA64_SGI_SN2 || IA64_GENERIC || IA64_HP_ZX1 ||
IA64_HP_ZX1_SWIOTLB)
depends on ARCH_DISCONTIGMEM_ENABLE
Index: linux-2.6.21-rc5-mm2/include/asm-ia64/page.h
===================================================================
--- linux-2.6.21-rc5-mm2.orig/include/asm-ia64/page.h 2007-04-02
16:15:29.000000000 -0700
+++ linux-2.6.21-rc5-mm2/include/asm-ia64/page.h 2007-04-02
16:15:50.000000000 -0700
@@ -106,6 +106,9 @@ extern int ia64_pfn_valid (unsigned long
# define ia64_pfn_valid(pfn) 1
#endif
+#define vmemmap ((struct page *)(RGN_BASE(RGN_GATE) + \
+ (1UL << (4*PAGE_SHIFT - 10))))
+
#ifdef CONFIG_VIRTUAL_MEM_MAP
extern struct page *vmem_map;
#ifdef CONFIG_DISCONTIGMEM
Index: linux-2.6.21-rc5-mm2/include/asm-ia64/pgtable.h
===================================================================
--- linux-2.6.21-rc5-mm2.orig/include/asm-ia64/pgtable.h 2007-04-02
16:15:29.000000000 -0700
+++ linux-2.6.21-rc5-mm2/include/asm-ia64/pgtable.h 2007-04-02
16:15:50.000000000 -0700
@@ -236,8 +236,13 @@ ia64_phys_addr_valid (unsigned long addr
# define VMALLOC_END vmalloc_end
extern unsigned long vmalloc_end;
#else
+#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_SPARSE_VIRTUAL)
+/* SPARSE_VIRTUAL uses half of vmalloc... */
+# define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT -
10)))
+#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))
-
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