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Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt 

* ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt:
  hrtimer: hook compat_sys_nanosleep up to high res timer code
  hrtimer: Rework hrtimer_nanosleep to make sys_compat_nanosleep easier
This commit is contained in:
Linus Torvalds 2007-10-18 15:12:41 -07:00
parent 2af170dd24 c70878b4e0
commit 58f9b52ee8
4 changed files with 42 additions and 63 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);

57
kernel/compat.c
View File

@ -40,62 +40,27 @@ int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
static long compat_nanosleep_restart(struct restart_block *restart)
{
unsigned long expire = restart->arg0, now = jiffies;
struct compat_timespec __user *rmtp;
/* Did it expire while we handled signals? */
if (!time_after(expire, now))
return 0;
expire = schedule_timeout_interruptible(expire - now);
if (expire == 0)
return 0;
rmtp = (struct compat_timespec __user *)restart->arg1;
if (rmtp) {
struct compat_timespec ct;
struct timespec t;
jiffies_to_timespec(expire, &t);
ct.tv_sec = t.tv_sec;
ct.tv_nsec = t.tv_nsec;
if (copy_to_user(rmtp, &ct, sizeof(ct)))
return -EFAULT;
}
/* The 'restart' block is already filled in */
return -ERESTART_RESTARTBLOCK;
}
asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
struct compat_timespec __user *rmtp)
struct compat_timespec __user *rmtp)
{
struct timespec t;
struct restart_block *restart;
unsigned long expire;
struct timespec tu, rmt;
long ret;
if (get_compat_timespec(&t, rqtp))
if (get_compat_timespec(&tu, rqtp))
return -EFAULT;
if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
if (!timespec_valid(&tu))
return -EINVAL;
expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
expire = schedule_timeout_interruptible(expire);
if (expire == 0)
return 0;
ret = hrtimer_nanosleep(&tu, rmtp ? &rmt : NULL, HRTIMER_MODE_REL,
CLOCK_MONOTONIC);
if (rmtp) {
jiffies_to_timespec(expire, &t);
if (put_compat_timespec(&t, rmtp))
if (ret && rmtp) {
if (put_compat_timespec(&rmt, rmtp))
return -EFAULT;
}
restart = &current_thread_info()->restart_block;
restart->fn = compat_nanosleep_restart;
restart->arg0 = jiffies + expire;
restart->arg1 = (unsigned long) rmtp;
return -ERESTART_RESTARTBLOCK;
return ret;
}
static inline long get_compat_itimerval(struct itimerval *o,

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