Drivers: hv: vmbus: Get the current time from the current clocksource
authorK. Y. Srinivasan <kys@microsoft.com>
Thu, 18 May 2017 17:46:02 +0000 (10:46 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 25 May 2017 13:42:42 +0000 (15:42 +0200)
The current code uses the MSR based mechanism to get the current tick.
Use the current clock source as that might be more optimal.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/include/asm/mshyperv.h
drivers/hv/hv.c

index fba1007139243b21081b6bfa114bed588e6f4e8e..18325dcdb7f12e192e387c2c74faba6ca437000b 100644 (file)
@@ -137,7 +137,6 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
        }
 }
 
-#define hv_get_current_tick(tick) rdmsrl(HV_X64_MSR_TIME_REF_COUNT, tick)
 #define hv_init_timer(timer, tick) wrmsrl(timer, tick)
 #define hv_init_timer_config(config, val) wrmsrl(config, val)
 
index 12e7baecb84ef4ac2becfd29040421a891e06f98..61fc8ce169a5523adf78ae838f7723afb9c0d4cf 100644 (file)
@@ -96,7 +96,7 @@ static int hv_ce_set_next_event(unsigned long delta,
 
        WARN_ON(!clockevent_state_oneshot(evt));
 
-       hv_get_current_tick(current_tick);
+       current_tick = hyperv_cs->read(NULL);
        current_tick += delta;
        hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
        return 0;