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>

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index d204b726a185e69091286cef0ade9216f091de58..2eaaa242c2e6a19b70ea24d46d4847703b71ffd1 100644 (file)
--- 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())