[RFC][PATCH 1/6] x86/topo: Store extra copy of SRAT table

[Peter Zijlstra <peterz@infradead.org>]

Because numa_emulate() will wreck the __apicid_to_node[] table, keep
an extra copy.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/include/asm/numa.h |    5 +++++
 arch/x86/mm/numa.c          |    4 ++++
 2 files changed, 9 insertions(+)

--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -19,13 +19,18 @@ extern int numa_off;
  * The mapping may be overridden by apic->numa_cpu_node() on 32bit and thus
  * should be accessed by the accessors - set_apicid_to_node() and
  * numa_cpu_node().
+ *
+ * __apicid_to_node[] is affected by numa_emulation(), while
+ * __apicid_to_phys_node[] is not.
  */
 extern s16 __apicid_to_node[MAX_LOCAL_APIC];
+extern s16 __apicid_to_phys_node[MAX_LOCAL_APIC];
 extern nodemask_t numa_nodes_parsed __initdata;
 
 static inline void set_apicid_to_node(int apicid, s16 node)
 {
 	__apicid_to_node[apicid] = node;
+	__apicid_to_phys_node[apicid] = node;
 }
 
 extern int numa_cpu_node(int cpu);
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -48,6 +48,10 @@ s16 __apicid_to_node[MAX_LOCAL_APIC] = {
 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
 };
 
+s16 __apicid_to_phys_node[MAX_LOCAL_APIC] = {
+	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
+};
+
 int numa_cpu_node(int cpu)
 {
 	u32 apicid = early_per_cpu(x86_cpu_to_apicid, cpu);