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time: Explicitly use u32 instead of int for shift values 

Ingo noted that using a u32 instead of int for shift values
would be better to make sure the compiler doesn't unnecessarily
use complex signed arithmetic.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Link: http://lkml.kernel.org/r/1342156917-25092-4-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
John Stultz 2012-07-13 01:21:52 -04:00 committed by Thomas Gleixner
parent 42e71e81f5
commit fee84c43e6
1 changed files with 3 additions and 3 deletions
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6
kernel/time/timekeeping.c
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@ -28,7 +28,7 @@ struct timekeeper {
/* NTP adjusted clock multiplier */ /* NTP adjusted clock multiplier */
u32 mult; u32 mult;
/* The shift value of the current clocksource. */ /* The shift value of the current clocksource. */
int shift; u32 shift;
/* Number of clock cycles in one NTP interval. */ /* Number of clock cycles in one NTP interval. */
cycle_t cycle_interval; cycle_t cycle_interval;
/* Number of clock shifted nano seconds in one NTP interval. */ /* Number of clock shifted nano seconds in one NTP interval. */
@ -45,7 +45,7 @@ struct timekeeper {
s64 ntp_error; s64 ntp_error;
/* Shift conversion between clock shifted nano seconds and /* Shift conversion between clock shifted nano seconds and
* ntp shifted nano seconds. */ * ntp shifted nano seconds. */
int ntp_error_shift; u32 ntp_error_shift;
/* The current time */ /* The current time */
struct timespec xtime; struct timespec xtime;
@ -960,7 +960,7 @@ static void timekeeping_adjust(s64 offset)
* *
* Returns the unconsumed cycles. * Returns the unconsumed cycles.
*/ */
static cycle_t logarithmic_accumulation(cycle_t offset, int shift) static cycle_t logarithmic_accumulation(cycle_t offset, u32 shift)
{ {
u64 nsecps = (u64)NSEC_PER_SEC << timekeeper.shift; u64 nsecps = (u64)NSEC_PER_SEC << timekeeper.shift;
u64 raw_nsecs; u64 raw_nsecs;