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Subject[PATCH] 2/6 Make CONFIG_NUMA work on non-numa machines.
From Andy Whitcroft

A few very simple changes in order to make CONFIG_NUMA work everywhere, so
the distros can build one common binary kernel for distributions.

diff -urpN -X /home/fletch/.diff.exclude 012-pfn_valid/arch/i386/Kconfig 013-numa_x86_pc/arch/i386/Kconfig
--- 012-pfn_valid/arch/i386/Kconfig Wed Mar 5 07:36:57 2003
+++ 013-numa_x86_pc/arch/i386/Kconfig Wed Mar 5 07:41:54 2003
@@ -488,7 +488,7 @@ config NR_CPUS
# Common NUMA Features
config NUMA
bool "Numa Memory Allocation Support"
- depends on (HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT && ACPI && !ACPI_HT_ONLY)))
+ depends on (HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT && ACPI && !ACPI_HT_ONLY))) || X86_PC

config DISCONTIGMEM
bool
diff -urpN -X /home/fletch/.diff.exclude 012-pfn_valid/arch/i386/kernel/smpboot.c 013-numa_x86_pc/arch/i386/kernel/smpboot.c
--- 012-pfn_valid/arch/i386/kernel/smpboot.c Wed Mar 5 07:36:57 2003
+++ 013-numa_x86_pc/arch/i386/kernel/smpboot.c Wed Mar 5 07:41:54 2003
@@ -966,6 +966,7 @@ static void __init smp_boot_cpus(unsigne
if (APIC_init_uniprocessor())
printk(KERN_NOTICE "Local APIC not detected."
" Using dummy APIC emulation.\n");
+ map_cpu_to_logical_apicid();
return;
}

diff -urpN -X /home/fletch/.diff.exclude 012-pfn_valid/arch/i386/mm/discontig.c 013-numa_x86_pc/arch/i386/mm/discontig.c
--- 012-pfn_valid/arch/i386/mm/discontig.c Wed Mar 5 07:41:52 2003
+++ 013-numa_x86_pc/arch/i386/mm/discontig.c Wed Mar 5 07:41:54 2003
@@ -82,6 +82,36 @@ void *node_remap_start_vaddr[MAX_NUMNODE
void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);

/*
+ * FLAT - support for basic PC memory model with discontig enabled, essentially
+ * a single node with all available processors in it with a flat
+ * memory map.
+ */
+void __init get_memcfg_numa_flat(void)
+{
+ int pfn;
+
+ printk("NUMA - single node, flat memory mode\n");
+
+ /* Run the memory configuration and find the top of memory. */
+ find_max_pfn();
+ node_start_pfn[0] = 0;
+ node_end_pfn[0] = max_pfn;
+
+ /* Fill in the physnode_map with our simplistic memory model,
+ * all memory is in node 0.
+ */
+ for (pfn = node_start_pfn[0]; pfn <= node_end_pfn[0];
+ pfn += PAGES_PER_ELEMENT)
+ {
+ physnode_map[pfn / PAGES_PER_ELEMENT] = 0;
+ }
+
+ /* Indicate there is one node available. */
+ node_set_online(0);
+ numnodes = 1;
+}
+
+/*
* Find the highest page frame number we have available for the node
*/
static void __init find_max_pfn_node(int nid)
diff -urpN -X /home/fletch/.diff.exclude 012-pfn_valid/include/asm-i386/mmzone.h 013-numa_x86_pc/include/asm-i386/mmzone.h
--- 012-pfn_valid/include/asm-i386/mmzone.h Wed Mar 5 07:41:53 2003
+++ 013-numa_x86_pc/include/asm-i386/mmzone.h Wed Mar 5 07:41:54 2003
@@ -123,6 +123,9 @@ static inline struct pglist_data *pfn_to
#include <asm/numaq.h>
#elif CONFIG_X86_SUMMIT
#include <asm/srat.h>
+#elif CONFIG_X86_PC
+#define get_memcfg_numa get_memcfg_numa_flat
+#define get_zholes_size(n) (0)
#else
#define pfn_to_nid(pfn) (0)
#endif /* CONFIG_X86_NUMAQ */
-
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