[patch V2 10/26] timekeeping: Prepare timekeeping_update_from_shadow()

[Thomas Gleixner <tglx@linutronix.de>]

From: Thomas Gleixner <tglx@linutronix.de>

Don't invoke the VDSO and paravirt updates when utilized for auxiliary
clocks. This is a temporary workaround until the VDSO and paravirt
interfaces have been worked out.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 kernel/time/timekeeping.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
---
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -683,13 +683,15 @@ static void timekeeping_update_from_shad
 
 	tk_update_leap_state(tk);
 	tk_update_ktime_data(tk);
+	tk->tkr_mono.base_real = tk->tkr_mono.base + tk->offs_real;
 
-	update_vsyscall(tk);
-	update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
+	if (tk->id == TIMEKEEPER_CORE) {
+		update_vsyscall(tk);
+		update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
 
-	tk->tkr_mono.base_real = tk->tkr_mono.base + tk->offs_real;
-	update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
-	update_fast_timekeeper(&tk->tkr_raw,  &tk_fast_raw);
+		update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
+		update_fast_timekeeper(&tk->tkr_raw,  &tk_fast_raw);
+	}
 
 	if (action & TK_CLOCK_WAS_SET)
 		tk->clock_was_set_seq++;