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Subject[PATCH for review] [23/48] x86_64: disable srat when numa emulation succeeds
Date

From: David Rientjes <rientjes@google.com>

When NUMA emulation succeeds, acpi_numa needs to be set to -1 so that
srat_disabled() will always return true. We won't be calling
acpi_scan_nodes() or registering the true nodes we've found.

[hugh@veritas.com: Fix x86_64 CONFIG_NUMA_EMU build: acpi_numa needs CONFIG_ACPI_NUMA]
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/x86_64/mm/numa.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux/arch/x86_64/mm/numa.c
===================================================================
--- linux.orig/arch/x86_64/mm/numa.c
+++ linux/arch/x86_64/mm/numa.c
@@ -473,9 +473,13 @@ out:

/*
* We need to vacate all active ranges that may have been registered by
- * SRAT.
+ * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
+ * true. NUMA emulation has succeeded so we will not scan ACPI nodes.
*/
remove_all_active_ranges();
+#ifdef CONFIG_ACPI_NUMA
+ acpi_numa = -1;
+#endif
for_each_node_mask(i, node_possible_map) {
e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT,
nodes[i].end >> PAGE_SHIFT);
-
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