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hrtimer: Rework hrtimer_nanosleep to make sys_compat_nanosleep easier 

Pull the copy_to_user out of hrtimer_nanosleep and into the callers
(common_nsleep, sys_nanosleep) in preparation for converting
compat_sys_nanosleep to use hrtimers.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Anton Blanchard 2007-10-15 16:06:04 -05:00 committed by Thomas Gleixner
parent d85714d81c
commit 04c227140f
3 changed files with 31 additions and 17 deletions
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2
include/linux/hrtimer.h
View File

@ -300,7 +300,7 @@ hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
/* Precise sleep: */
extern long hrtimer_nanosleep(struct timespec *rqtp,
struct timespec __user *rmtp,
struct timespec *rmtp,
const enum hrtimer_mode mode,
const clockid_t clockid);
extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);

29
kernel/hrtimer.c
View File

@ -1286,8 +1286,7 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
{
struct hrtimer_sleeper t;
struct timespec __user *rmtp;
struct timespec tu;
struct timespec *rmtp;
ktime_t time;
restart->fn = do_no_restart_syscall;
@ -1298,14 +1297,12 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
if (do_nanosleep(&t, HRTIMER_MODE_ABS))
return 0;
rmtp = (struct timespec __user *) restart->arg1;
rmtp = (struct timespec *)restart->arg1;
if (rmtp) {
time = ktime_sub(t.timer.expires, t.timer.base->get_time());
if (time.tv64 <= 0)
return 0;
tu = ktime_to_timespec(time);
if (copy_to_user(rmtp, &tu, sizeof(tu)))
return -EFAULT;
*rmtp = ktime_to_timespec(time);
}
restart->fn = hrtimer_nanosleep_restart;
@ -1314,12 +1311,11 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
return -ERESTART_RESTARTBLOCK;
}
long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
long hrtimer_nanosleep(struct timespec *rqtp, struct timespec *rmtp,
const enum hrtimer_mode mode, const clockid_t clockid)
{
struct restart_block *restart;
struct hrtimer_sleeper t;
struct timespec tu;
ktime_t rem;
hrtimer_init(&t.timer, clockid, mode);
@ -1335,9 +1331,7 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
rem = ktime_sub(t.timer.expires, t.timer.base->get_time());
if (rem.tv64 <= 0)
return 0;
tu = ktime_to_timespec(rem);
if (copy_to_user(rmtp, &tu, sizeof(tu)))
return -EFAULT;
*rmtp = ktime_to_timespec(rem);
}
restart = &current_thread_info()->restart_block;
@ -1353,7 +1347,8 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
asmlinkage long
sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
{
struct timespec tu;
struct timespec tu, rmt;
int ret;
if (copy_from_user(&tu, rqtp, sizeof(tu)))
return -EFAULT;
@ -1361,7 +1356,15 @@ sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
if (!timespec_valid(&tu))
return -EINVAL;
return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
ret = hrtimer_nanosleep(&tu, rmtp ? &rmt : NULL, HRTIMER_MODE_REL,
CLOCK_MONOTONIC);
if (ret && rmtp) {
if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
return -EFAULT;
}
return ret;
}
/*

17
kernel/posix-timers.c
View File

@ -981,9 +981,20 @@ sys_clock_getres(const clockid_t which_clock, struct timespec __user *tp)
static int common_nsleep(const clockid_t which_clock, int flags,
struct timespec *tsave, struct timespec __user *rmtp)
{
return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
struct timespec rmt;
int ret;
ret = hrtimer_nanosleep(tsave, rmtp ? &rmt : NULL,
flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
if (ret && rmtp) {
if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
return -EFAULT;
}
return ret;
}
asmlinkage long