1 files changed, 29 insertions, 74 deletions

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 4bf66cc4a267..6cceed4df73e 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -28,12 +28,14 @@
 #include <linux/profile.h>
 #include <linux/timex.h>
 #include <linux/notifier.h>
+#include <linux/clocksource.h>
 
 #include <asm/uaccess.h>
 #include <asm/delay.h>
 #include <asm/s390_ext.h>
 #include <asm/div64.h>
 #include <asm/irq.h>
+#include <asm/irq_regs.h>
 #include <asm/timer.h>
 
 /* change this if you have some constant time drift */
@@ -81,78 +83,10 @@ void tod_to_timeval(__u64 todval, struct timespec *xtime)
         xtime->tv_nsec = ((todval * 1000) >> 12);
 }
 
-static inline unsigned long do_gettimeoffset(void) 
-{
-        __u64 now;
-
-        now = (get_clock() - jiffies_timer_cc) >> 12;
-        now -= (__u64) jiffies * USECS_PER_JIFFY;
-        return (unsigned long) now;
-}
-
-/*
- * This version of gettimeofday has microsecond resolution.
- */
-void do_gettimeofday(struct timeval *tv)
-{
-        unsigned long flags;
-        unsigned long seq;
-        unsigned long usec, sec;
-
-        do {
-                seq = read_seqbegin_irqsave(&xtime_lock, flags);
-
-                sec = xtime.tv_sec;
-                usec = xtime.tv_nsec / 1000 + do_gettimeoffset();
-        } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
-        while (usec >= 1000000) {
-                usec -= 1000000;
-                sec++;
-        }
-
-        tv->tv_sec = sec;
-        tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
-int do_settimeofday(struct timespec *tv)
-{
-        time_t wtm_sec, sec = tv->tv_sec;
-        long wtm_nsec, nsec = tv->tv_nsec;
-
-        if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
-                return -EINVAL;
-
-        write_seqlock_irq(&xtime_lock);
-        /* This is revolting. We need to set the xtime.tv_nsec
-         * correctly. However, the value in this location is
-         * is value at the last tick.
-         * Discover what correction gettimeofday
-         * would have done, and then undo it!
-         */
-        nsec -= do_gettimeoffset() * 1000;
-
-        wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
-        wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
-        set_normalized_timespec(&xtime, sec, nsec);
-        set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
-        ntp_clear();
-        write_sequnlock_irq(&xtime_lock);
-        clock_was_set();
-        return 0;
-}
-
-EXPORT_SYMBOL(do_settimeofday);
-
-
 #ifdef CONFIG_PROFILING
-#define s390_do_profile(regs)   profile_tick(CPU_PROFILING, regs)
+#define s390_do_profile()       profile_tick(CPU_PROFILING)
 #else
-#define s390_do_profile(regs)  do { ; } while(0)
+#define s390_do_profile()       do { ; } while(0)
 #endif /* CONFIG_PROFILING */
 
 
@@ -160,7 +94,7 @@ EXPORT_SYMBOL(do_settimeofday);
  * timer_interrupt() needs to keep up the real-time clock,
  * as well as call the "do_timer()" routine every clocktick
  */
-void account_ticks(struct pt_regs *regs)
+void account_ticks(void)
 {
         __u64 tmp;
         __u32 ticks;
@@ -221,10 +155,10 @@ void account_ticks(struct pt_regs *regs)
         account_tick_vtime(current);
 #else
         while (ticks--)
-                update_process_times(user_mode(regs));
+                update_process_times(user_mode(get_irq_regs()));
 #endif
 
-        s390_do_profile(regs);
+        s390_do_profile();
 }
 
 #ifdef CONFIG_NO_IDLE_HZ
@@ -285,9 +219,11 @@ static inline void stop_hz_timer(void)
  */
 static inline void start_hz_timer(void)
 {
+        BUG_ON(!in_interrupt());
+
         if (!cpu_isset(smp_processor_id(), nohz_cpu_mask))
                 return;
-        account_ticks(task_pt_regs(current));
+        account_ticks();
         cpu_clear(smp_processor_id(), nohz_cpu_mask);
 }
 
@@ -337,6 +273,22 @@ void init_cpu_timer(void)
 
 extern void vtime_init(void);
 
+static cycle_t read_tod_clock(void)
+{
+        return get_clock();
+}
+
+static struct clocksource clocksource_tod = {
+        .name           = "tod",
+        .rating         = 100,
+        .read           = read_tod_clock,
+        .mask           = -1ULL,
+        .mult           = 1000,
+        .shift          = 12,
+        .is_continuous  = 1,
+};
+
+
 /*
  * Initialize the TOD clock and the CPU timer of
  * the boot cpu.
@@ -381,6 +333,9 @@ void __init time_init(void)
                                               &ext_int_info_cc) != 0)
                 panic("Couldn't request external interrupt 0x1004");
 
+        if (clocksource_register(&clocksource_tod) != 0)
+                panic("Could not register TOD clock source");
+
         init_cpu_timer();
 
 #ifdef CONFIG_NO_IDLE_HZ