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authorDengChao <chao.deng@linaro.org>2015-12-13 12:26:42 +0800
committerJohn Stultz <john.stultz@linaro.org>2015-12-16 16:50:56 -0800
commitc796348774f15c6e682834ed288bcae0f2c95707 (patch)
tree693a7d9879af61c226bd2b51d6e8bbe7920388e4 /kernel/time/ntp_internal.h
parent0af864651b459afb0435ee8786a19cbe5a044cdb (diff)
ntp: Fix second_overflow's input parameter type to be 64bits
The function "second_overflow" uses "unsign long" as its input parameter type which will overflow after year 2106 on 32bit systems. Thus this patch replaces it with time64_t type. While the 64-bit division is expensive, "next_ntp_leap_sec" has been calculated already, so we can just re-use it in the TIME_INS/DEL cases, allowing one expensive division per leapsecond instead of re-doing the divsion once a second after the leap flag has been set. Signed-off-by: DengChao <chao.deng@linaro.org> [jstultz: Tweaked commit message] Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time/ntp_internal.h')
-rw-r--r--kernel/time/ntp_internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
index af924470eac0..d8a7c11fa71a 100644
--- a/kernel/time/ntp_internal.h
+++ b/kernel/time/ntp_internal.h
@@ -6,7 +6,7 @@ extern void ntp_clear(void);
/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
extern u64 ntp_tick_length(void);
extern ktime_t ntp_get_next_leap(void);
-extern int second_overflow(unsigned long secs);
+extern int second_overflow(time64_t secs);
extern int ntp_validate_timex(struct timex *);
extern int __do_adjtimex(struct timex *, struct timespec64 *, s32 *);
extern void __hardpps(const struct timespec64 *, const struct timespec64 *);