time: Move get_jiffies_64 to kernel/time/jiffies.c

[firefly-linux-kernel-4.4.55.git] / kernel / time / jiffies.c

diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 5404a84569094f3cef796e903ad6a4cb92a8b3e8..2fbc207447974482259c7c68e2151bc94220f396 100644 (file)
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -22,6 +22,7 @@
 ************************************************************************/
 #include <linux/clocksource.h>
 #include <linux/jiffies.h>
+#include <linux/module.h>
 #include <linux/init.h>
 
 /* The Jiffies based clocksource is the lowest common
@@ -64,6 +65,23 @@ struct clocksource clocksource_jiffies = {
        .shift          = JIFFIES_SHIFT,
 };
 
+#if (BITS_PER_LONG < 64)
+u64 get_jiffies_64(void)
+{
+       unsigned long seq;
+       u64 ret;
+
+       do {
+               seq = read_seqbegin(&xtime_lock);
+               ret = jiffies_64;
+       } while (read_seqretry(&xtime_lock, seq));
+       return ret;
+}
+EXPORT_SYMBOL(get_jiffies_64);
+#endif
+
+EXPORT_SYMBOL(jiffies);
+
 static int __init init_jiffies_clocksource(void)
 {
        return clocksource_register(&clocksource_jiffies);