[RFT][PATCH v7 4/8] jiffies: Introduce USER_TICK_USEC and redefine TICK_USEC

Rafael J. Wysocki
2018-03-20T16:44:15Z

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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>
---
drivers/net/ethernet/sfc/mcdi.c | 2 +-
include/linux/jiffies.h | 7 +++++--
kernel/time/ntp.c | 2 +-
3 files changed, 7 insertions(+), 4 deletions(-)

Index: linux-pm/include/linux/jiffies.h
===================================================================
--- linux-pm.orig/include/linux/jiffies.h
+++ linux-pm/include/linux/jiffies.h
@@ -62,8 +62,11 @@ 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
Index: linux-pm/drivers/net/ethernet/sfc/mcdi.c
===================================================================
--- linux-pm.orig/drivers/net/ethernet/sfc/mcdi.c
+++ linux-pm/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) {
Index: linux-pm/kernel/time/ntp.c
===================================================================
--- linux-pm.orig/kernel/time/ntp.c
+++ linux-pm/kernel/time/ntp.c
@@ -31,7 +31,7 @@

/* 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;