From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 20 Mar 2018 10:11:28 +0100
Subject: jiffies: Introduce USER_TICK_USEC and redefine TICK_USEC
Patch-mainline: v4.17-rc1
Git-commit: efefc97736e6f3261879bc9dddcb161224a455f5
References: bsc#1105555 FATE#326117

Since the subsequent changes will need a TICK_USEC definition
analogous to TICK_NSEC, rename the existing TICK_USEC as
USER_TICK_USEC, update its users and redefine TICK_USEC
accordingly.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/sfc/mcdi.c |    2 +-
 include/linux/jiffies.h         |    7 +++++--
 kernel/time/ntp.c               |    2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/sfc/mcdi.c
+++ b/drivers/net/ethernet/sfc/mcdi.c
@@ -375,7 +375,7 @@ static int efx_mcdi_poll(struct efx_nic
 	 * because generally mcdi responses are fast. After that, back off
 	 * and poll once a jiffy (approximately)
 	 */
-	spins = TICK_USEC;
+	spins = USER_TICK_USEC;
 	finish = jiffies + MCDI_RPC_TIMEOUT;
 
 	while (1) {
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -61,8 +61,11 @@ extern int register_refined_jiffies(long
 /* TICK_NSEC is the time between ticks in nsec assuming SHIFTED_HZ */
 #define TICK_NSEC ((NSEC_PER_SEC+HZ/2)/HZ)
 
-/* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
-#define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
+/* TICK_USEC is the time between ticks in usec assuming SHIFTED_HZ */
+#define TICK_USEC ((USEC_PER_SEC + HZ/2) / HZ)
+
+/* USER_TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
+#define USER_TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
 
 #ifndef __jiffy_arch_data
 #define __jiffy_arch_data
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -30,7 +30,7 @@
 
 
 /* USER_HZ period (usecs): */
-unsigned long			tick_usec = TICK_USEC;
+unsigned long			tick_usec = USER_TICK_USEC;
 
 /* SHIFTED_HZ period (nsecs): */
 unsigned long			tick_nsec;