From b8712f8ecc524fc42f6af2aab17052f1b05f1ec5 Mon Sep 17 00:00:00 2001
From: compudj <compudj@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Tue, 9 Jan 2007 00:11:15 +0000
Subject: [PATCH] add test local

git-svn-id: http://ltt.polymtl.ca/svn@2325 04897980-b3bd-0310-b5e0-8ef037075253
---
 tests/kernel/Makefile     |  1 +
 tests/kernel/test-local.c | 69 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 tests/kernel/test-local.c

diff --git a/tests/kernel/Makefile b/tests/kernel/Makefile
index 07661469..23b718bd 100644
--- a/tests/kernel/Makefile
+++ b/tests/kernel/Makefile
@@ -11,6 +11,7 @@ endif
 	obj-m += test-debugfs.o
 	obj-m += test-hotplug.o
 	obj-m += rdtsc-smp.o
+	obj-m += test-local.o
 #	obj-m += test-cmpxchg.o
 #	obj-m += test-cmpxchg-nolock.o
 #	obj-m += test-spinlock.o
diff --git a/tests/kernel/test-local.c b/tests/kernel/test-local.c
new file mode 100644
index 00000000..3f74375a
--- /dev/null
+++ b/tests/kernel/test-local.c
@@ -0,0 +1,69 @@
+/* test-local.c
+ *
+ * Sample module for local.h usage.
+ */
+
+
+#include <asm/local.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+
+static DEFINE_PER_CPU(local_t, counters) = LOCAL_INIT(0);
+
+static struct timer_list test_timer;
+
+/* IPI called on each CPU. */
+static void test_each(void *info)
+{
+	/* Increment the counter from a non preemptible context */
+	printk("Increment on cpu %d\n", smp_processor_id());
+	local_inc(&__get_cpu_var(counters));
+
+	/* This is what incrementing the variable would look like within a
+	 * preemptible context (it disables preemption) :
+	 *
+	 * local_inc(&get_cpu_var(counters));
+	 * put_cpu_var(counters);
+	 */
+}
+static void do_test_timer(unsigned long data)
+{
+	int cpu;
+
+	/* Increment the counters */
+	on_each_cpu(test_each, NULL, 0, 1);
+	/* Read all the counters */
+	printk("Counters read from CPU %d\n", smp_processor_id());
+	for_each_online_cpu(cpu) {
+		printk("Read : CPU %d, count %ld\n", cpu,
+			local_read(&per_cpu(counters, cpu)));
+	}
+	del_timer(&test_timer);
+	test_timer.expires = jiffies + 1000;
+	add_timer(&test_timer);
+}
+
+static int __init test_init(void)
+{
+	/* initialize the timer that will increment the counter */
+	init_timer(&test_timer);
+	test_timer.function = do_test_timer;
+	test_timer.expires = jiffies + 1;
+	add_timer(&test_timer);
+
+	return 0;
+}
+
+static void __exit test_exit(void)
+{
+	del_timer_sync(&test_timer);
+}
+
+module_init(test_init);
+module_exit(test_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Local Atomic Ops");
+
-- 
2.34.1