* [PATCH v4 12/25] posix-timers:Convert to the 64bit methods for the clock_settime syscall function
@ 2015-06-01 11:57 Baolin Wang
0 siblings, 0 replies; only message in thread
From: Baolin Wang @ 2015-06-01 11:57 UTC (permalink / raw
To: tglx; +Cc: arnd, linux-kernel, baolin.wang, y2038
This patch introduces the clock_set64 method with timespec64 type for
k_clock structure, that makes it ready for the 2038 year.
Convert to the 64bit method with timespec64 type for the clock_settime
syscall function, and change the clock_settime syscall implementation.
Also add a default 64bit method for the clock_set64 pointer of
k_clock structure, and it will be removed after all the drivers are
converted to 64bit methods.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
include/linux/posix-timers.h | 2 ++
kernel/time/posix-timers.c | 24 +++++++++++++++++++-----
2 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 16c3364..2b19ec8 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -100,6 +100,8 @@ struct k_clock {
int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
int (*clock_set) (const clockid_t which_clock,
const struct timespec *tp);
+ int (*clock_set64) (const clockid_t which_clock,
+ const struct timespec64 *tp);
int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
int (*clock_adj) (const clockid_t which_clock, struct timex *tx);
int (*timer_create) (struct k_itimer *timer);
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 9912745..06e2549 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -570,6 +570,18 @@ static int default_timer_set64(struct k_itimer *timr, int flags,
return ret;
}
+static int default_clock_set64(const clockid_t which_clock,
+ const struct timespec64 *tp64)
+{
+ struct k_clock *kc = clockid_to_kclock(which_clock);
+ struct timespec tp;
+ int ret;
+
+ tp = timespec64_to_timespec(*tp64);
+ ret = kc->clock_set(which_clock, &tp);
+ return ret;
+}
+
void posix_timers_register_clock(const clockid_t clock_id,
struct k_clock *new_clock)
{
@@ -594,6 +606,8 @@ void posix_timers_register_clock(const clockid_t clock_id,
new_clock->timer_get64 = default_timer_get64;
if (new_clock->timer_set && !new_clock->timer_set64)
new_clock->timer_set64 = default_timer_set64;
+ if (new_clock->clock_set && !new_clock->clock_set64)
+ new_clock->clock_set64 = default_clock_set64;
posix_clocks[clock_id] = *new_clock;
}
@@ -1082,22 +1096,22 @@ void exit_itimers(struct signal_struct *sig)
}
}
-static int __clock_settime(clockid_t which_clock, struct timespec *ts)
+static int __clock_settime(clockid_t which_clock, struct timespec64 *ts)
{
struct k_clock *kc = clockid_to_kclock(which_clock);
- if (!kc || !kc->clock_set)
+ if (!kc || !kc->clock_set64)
return -EINVAL;
- return kc->clock_set(which_clock, ts);
+ return kc->clock_set64(which_clock, ts);
}
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
const struct timespec __user *, tp)
{
- struct timespec new_tp;
+ struct timespec64 new_tp;
- if (copy_from_user(&new_tp, tp, sizeof (*tp)))
+ if (get_timespec(&new_tp, tp))
return -EFAULT;
return __clock_settime(which_clock, &new_tp);
--
1.7.9.5
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