powerpc/time: Remove unnecessary sanity check of decrementer expiration

The clockevents code uses max_delta_ns to avoid calling a
clockevent with too large a value.

Remove the redundant version of this in the timer_interrupt
code.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 3 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index d204b726a185..2eaaa242c2e6 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -572,7 +572,6 @@ void timer_interrupt(struct pt_regs * regs)
         struct pt_regs *old_regs;
         struct decrementer_clock *decrementer =  &__get_cpu_var(decrementers);
         struct clock_event_device *evt = &decrementer->event;
-        u64 now;
 
         /* Ensure a positive value is written to the decrementer, or else
          * some CPUs will continue to take decrementer exceptions.
@@ -607,16 +606,9 @@ void timer_interrupt(struct pt_regs * regs)
                 get_lppaca()->int_dword.fields.decr_int = 0;
 #endif
 
-        now = get_tb_or_rtc();
-        if (now >= decrementer->next_tb) {
-                decrementer->next_tb = ~(u64)0;
-                if (evt->event_handler)
-                        evt->event_handler(evt);
-        } else {
-                now = decrementer->next_tb - now;
-                if (now <= DECREMENTER_MAX)
-                        set_dec((int)now);
-        }
+        decrementer->next_tb = ~(u64)0;
+        if (evt->event_handler)
+                evt->event_handler(evt);
 
 #ifdef CONFIG_PPC_ISERIES
         if (firmware_has_feature(FW_FEATURE_ISERIES) && hvlpevent_is_pending())