From 215c3409eed16c89b6d11ea1126bd9d4f36b9afd Mon Sep 17 00:00:00 2001
From: Andy Whitcroft <apw@shadowen.org>
Date: Fri, 6 Jan 2006 00:12:06 -0800
Subject: [PATCH] [PATCH] i386 sparsemem for single node systems
Allow SPARSEMEM to be enabled on non-numa x86 systems. This is made
dependant on EXPERIMENTAL also being set. When an in-tree user (such as
simulated numa) exists it should be made dependant on that.
The plan is to have no options and no selector as normal when
!EXPERIMENTAL. When EXPERIMENTAL we enable the FLATMEM and SPARSEMEM
options for X86_PC whilst maintaining DISCONTIGMEM and SPARSEMEM for NUMA.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
arch/i386/Kconfig | 8 ++++++--
arch/i386/kernel/setup.c | 8 ++++++++
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 6004bb0795e09..968fabd8723fd 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -464,7 +464,6 @@ config NUMA
depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
default n if X86_PC
default y if (X86_NUMAQ || X86_SUMMIT)
- select SPARSEMEM_STATIC
# Need comments to help the hapless user trying to turn on NUMA support
comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
@@ -493,6 +492,10 @@ config HAVE_ARCH_ALLOC_REMAP
depends on NUMA
default y
+config ARCH_FLATMEM_ENABLE
+ def_bool y
+ depends on (ARCH_SELECT_MEMORY_MODEL && X86_PC)
+
config ARCH_DISCONTIGMEM_ENABLE
def_bool y
depends on NUMA
@@ -503,7 +506,8 @@ config ARCH_DISCONTIGMEM_DEFAULT
config ARCH_SPARSEMEM_ENABLE
def_bool y
- depends on NUMA
+ depends on (NUMA || (X86_PC && EXPERIMENTAL))
+ select SPARSEMEM_STATIC
config ARCH_SELECT_MEMORY_MODEL
def_bool y
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index fdfcb0cba9b40..27c956db04615 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -954,6 +954,12 @@ efi_find_max_pfn(unsigned long start, unsigned long end, void *arg)
return 0;
}
+static int __init
+efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
+{
+ memory_present(0, start, end);
+ return 0;
+}
/*
* Find the highest page frame number we have available
@@ -965,6 +971,7 @@ void __init find_max_pfn(void)
max_pfn = 0;
if (efi_enabled) {
efi_memmap_walk(efi_find_max_pfn, &max_pfn);
+ efi_memmap_walk(efi_memory_present_wrapper, NULL);
return;
}
@@ -979,6 +986,7 @@ void __init find_max_pfn(void)
continue;
if (end > max_pfn)
max_pfn = end;
+ memory_present(0, start, end);
}
}
--
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