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jiffies: Introduce USER_TICK_USEC and redefine TICK_USEC

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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>
This commit is contained in:
Rafael J. Wysocki 2018-03-20 10:11:28 +01:00
parent ed98c34919
commit efefc97736
3 changed files with 7 additions and 4 deletions
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2
drivers/net/ethernet/sfc/mcdi.c
View file

@ -375,7 +375,7 @@ static int efx_mcdi_poll(struct efx_nic *efx)
* 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) {

7
include/linux/jiffies.h
View file

@ -62,8 +62,11 @@ extern int register_refined_jiffies(long clock_tick_rate);
/* 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

2
kernel/time/ntp.c
View file

@ -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;