qspinlock: numaware: Add ARM64 support

hulk inclusion
category: feature
bugzilla: 13227
CVE: NA

-------------------------------------------------

Enabling CNA is controlled via a new configuration option
(NUMA_AWARE_SPINLOCKS). Add it for arm64 support.
Signed-off-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/Kconfig

@@ -795,6 +795,20 @@ config NODES_SHIFT
 	  Specify the maximum number of NUMA Nodes available on the target
 	  system.  Increases memory reserved to accommodate various tables.
 
+config NUMA_AWARE_SPINLOCKS
+	bool "Numa-aware spinlocks"
+	depends on NUMA && QUEUED_SPINLOCKS
+	default n
+	help
+	  Introduce NUMA (Non Uniform Memory Access) awareness into
+	  the slow path of spinlocks.
+
+	  The kernel will try to keep the lock on the same node,
+	  thus reducing the number of remote cache misses, while
+	  trading some of the short term fairness for better performance.
+
+	  Say N if you want absolute first come first serve fairness.
+
 config USE_PERCPU_NUMA_NODE_ID
 	def_bool y
 	depends on NUMA