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authorTejun Heo <tj@kernel.org>2011-02-16 19:11:09 +0300
committerTejun Heo <tj@kernel.org>2011-02-16 19:11:09 +0300
commitac7136b611ee8f8bd6231ce2e1dbdd31ae3d39bc (patch)
tree41f6809ba694a723b521573c2e8d34c652c31281 /arch/x86/include/asm/acpi.h
parent4697bdcc945c094d2c8a4876a24faeaf31a283e0 (diff)
downloadlinux-ac7136b611ee8f8bd6231ce2e1dbdd31ae3d39bc.tar.xz
x86-64, NUMA: Implement generic node distance handling
Node distance either used direct node comparison, ACPI PXM comparison or ACPI SLIT table lookup. This patch implements generic node distance handling. NUMA init methods can call numa_set_distance() to set distance between nodes and the common __node_distance() implementation will report the set distance. Due to the way NUMA emulation is implemented, the generic node distance handling is used only when emulation is not used. Later patches will update NUMA emulation to use the generic distance mechanism. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Shaohui Zheng <shaohui.zheng@intel.com> Cc: David Rientjes <rientjes@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/acpi.h')
-rw-r--r--arch/x86/include/asm/acpi.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index cfa3d5c3144a..9c9fe1b0bc4e 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -190,6 +190,7 @@ extern int x86_acpi_numa_init(void);
#ifdef CONFIG_NUMA_EMU
extern void acpi_fake_nodes(const struct bootnode *fake_nodes,
int num_nodes);
+extern int acpi_emu_node_distance(int a, int b);
#endif
#endif /* CONFIG_ACPI_NUMA */