X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=kernel%2Fitimer.c;h=58762f7077ec003cc1a26e793b423006ecce73a7;hb=cac64d00c256e65776d575e82aaf540632b66178;hp=680e6b70c8726f00d6a5d4dc3888fa5218b498fe;hpb=7d99b7d634d81bb372e03e4561c80430aa4cfac2;p=safe%2Fjmp%2Flinux-2.6 diff --git a/kernel/itimer.c b/kernel/itimer.c index 680e6b7..58762f7 100644 --- a/kernel/itimer.c +++ b/kernel/itimer.c @@ -7,7 +7,6 @@ /* These are all the functions necessary to implement itimers */ #include -#include #include #include #include @@ -56,17 +55,15 @@ int do_getitimer(int which, struct itimerval *value) spin_unlock_irq(&tsk->sighand->siglock); break; case ITIMER_VIRTUAL: - read_lock(&tasklist_lock); spin_lock_irq(&tsk->sighand->siglock); cval = tsk->signal->it_virt_expires; cinterval = tsk->signal->it_virt_incr; if (!cputime_eq(cval, cputime_zero)) { - struct task_struct *t = tsk; - cputime_t utime = tsk->signal->utime; - do { - utime = cputime_add(utime, t->utime); - t = next_thread(t); - } while (t != tsk); + struct task_cputime cputime; + cputime_t utime; + + thread_group_cputimer(tsk, &cputime); + utime = cputime.utime; if (cputime_le(cval, utime)) { /* about to fire */ cval = jiffies_to_cputime(1); } else { @@ -74,25 +71,19 @@ int do_getitimer(int which, struct itimerval *value) } } spin_unlock_irq(&tsk->sighand->siglock); - read_unlock(&tasklist_lock); cputime_to_timeval(cval, &value->it_value); cputime_to_timeval(cinterval, &value->it_interval); break; case ITIMER_PROF: - read_lock(&tasklist_lock); spin_lock_irq(&tsk->sighand->siglock); cval = tsk->signal->it_prof_expires; cinterval = tsk->signal->it_prof_incr; if (!cputime_eq(cval, cputime_zero)) { - struct task_struct *t = tsk; - cputime_t ptime = cputime_add(tsk->signal->utime, - tsk->signal->stime); - do { - ptime = cputime_add(ptime, - cputime_add(t->utime, - t->stime)); - t = next_thread(t); - } while (t != tsk); + struct task_cputime times; + cputime_t ptime; + + thread_group_cputimer(tsk, ×); + ptime = cputime_add(times.utime, times.stime); if (cputime_le(cval, ptime)) { /* about to fire */ cval = jiffies_to_cputime(1); } else { @@ -100,7 +91,6 @@ int do_getitimer(int which, struct itimerval *value) } } spin_unlock_irq(&tsk->sighand->siglock); - read_unlock(&tasklist_lock); cputime_to_timeval(cval, &value->it_value); cputime_to_timeval(cinterval, &value->it_interval); break; @@ -110,7 +100,7 @@ int do_getitimer(int which, struct itimerval *value) return 0; } -asmlinkage long sys_getitimer(int which, struct itimerval __user *value) +SYSCALL_DEFINE2(getitimer, int, which, struct itimerval __user *, value) { int error = -EFAULT; struct itimerval get_buffer; @@ -128,75 +118,22 @@ asmlinkage long sys_getitimer(int which, struct itimerval __user *value) /* * The timer is automagically restarted, when interval != 0 */ -int it_real_fn(void *data) +enum hrtimer_restart it_real_fn(struct hrtimer *timer) { - struct task_struct *tsk = (struct task_struct *) data; - - send_group_sig_info(SIGALRM, SEND_SIG_PRIV, tsk); + struct signal_struct *sig = + container_of(timer, struct signal_struct, real_timer); - if (tsk->signal->it_real_incr.tv64 != 0) { - hrtimer_forward(&tsk->signal->real_timer, - tsk->signal->it_real_incr); + kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid); - return HRTIMER_RESTART; - } return HRTIMER_NORESTART; } /* - * We do not care about correctness. We just sanitize the values so - * the ktime_t operations which expect normalized values do not - * break. This converts negative values to long timeouts similar to - * the code in kernel versions < 2.6.16 - * - * Print a limited number of warning messages when an invalid timeval - * is detected. - */ -static void fixup_timeval(struct timeval *tv, int interval) -{ - static int warnlimit = 10; - unsigned long tmp; - - if (warnlimit > 0) { - warnlimit--; - printk(KERN_WARNING - "setitimer: %s (pid = %d) provided " - "invalid timeval %s: tv_sec = %ld tv_usec = %ld\n", - current->comm, current->pid, - interval ? "it_interval" : "it_value", - tv->tv_sec, (long) tv->tv_usec); - } - - tmp = tv->tv_usec; - if (tmp >= USEC_PER_SEC) { - tv->tv_usec = tmp % USEC_PER_SEC; - tv->tv_sec += tmp / USEC_PER_SEC; - } - - tmp = tv->tv_sec; - if (tmp > LONG_MAX) - tv->tv_sec = LONG_MAX; -} - -/* * Returns true if the timeval is in canonical form */ #define timeval_valid(t) \ (((t)->tv_sec >= 0) && (((unsigned long) (t)->tv_usec) < USEC_PER_SEC)) -/* - * Check for invalid timevals, sanitize them and print a limited - * number of warnings. - */ -static void check_itimerval(struct itimerval *value) { - - if (unlikely(!timeval_valid(&value->it_value))) - fixup_timeval(&value->it_value, 0); - - if (unlikely(!timeval_valid(&value->it_interval))) - fixup_timeval(&value->it_interval, 1); -} - int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue) { struct task_struct *tsk = current; @@ -206,15 +143,10 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue) /* * Validate the timevals in value. - * - * Note: Although the spec requires that invalid values shall - * return -EINVAL, we just fixup the value and print a limited - * number of warnings in order not to break users of this - * historical misfeature. - * - * Scheduled for replacement in March 2007 */ - check_itimerval(value); + if (!timeval_valid(&value->it_value) || + !timeval_valid(&value->it_interval)) + return -EINVAL; switch (which) { case ITIMER_REAL: @@ -231,17 +163,19 @@ again: spin_unlock_irq(&tsk->sighand->siglock); goto again; } - tsk->signal->it_real_incr = - timeval_to_ktime(value->it_interval); expires = timeval_to_ktime(value->it_value); - if (expires.tv64 != 0) - hrtimer_start(timer, expires, HRTIMER_REL); + if (expires.tv64 != 0) { + tsk->signal->it_real_incr = + timeval_to_ktime(value->it_interval); + hrtimer_start(timer, expires, HRTIMER_MODE_REL); + } else + tsk->signal->it_real_incr.tv64 = 0; + spin_unlock_irq(&tsk->sighand->siglock); break; case ITIMER_VIRTUAL: nval = timeval_to_cputime(&value->it_value); ninterval = timeval_to_cputime(&value->it_interval); - read_lock(&tasklist_lock); spin_lock_irq(&tsk->sighand->siglock); cval = tsk->signal->it_virt_expires; cinterval = tsk->signal->it_virt_incr; @@ -256,7 +190,6 @@ again: tsk->signal->it_virt_expires = nval; tsk->signal->it_virt_incr = ninterval; spin_unlock_irq(&tsk->sighand->siglock); - read_unlock(&tasklist_lock); if (ovalue) { cputime_to_timeval(cval, &ovalue->it_value); cputime_to_timeval(cinterval, &ovalue->it_interval); @@ -265,7 +198,6 @@ again: case ITIMER_PROF: nval = timeval_to_cputime(&value->it_value); ninterval = timeval_to_cputime(&value->it_interval); - read_lock(&tasklist_lock); spin_lock_irq(&tsk->sighand->siglock); cval = tsk->signal->it_prof_expires; cinterval = tsk->signal->it_prof_incr; @@ -280,7 +212,6 @@ again: tsk->signal->it_prof_expires = nval; tsk->signal->it_prof_incr = ninterval; spin_unlock_irq(&tsk->sighand->siglock); - read_unlock(&tasklist_lock); if (ovalue) { cputime_to_timeval(cval, &ovalue->it_value); cputime_to_timeval(cinterval, &ovalue->it_interval); @@ -329,9 +260,8 @@ unsigned int alarm_setitimer(unsigned int seconds) return it_old.it_value.tv_sec; } -asmlinkage long sys_setitimer(int which, - struct itimerval __user *value, - struct itimerval __user *ovalue) +SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value, + struct itimerval __user *, ovalue) { struct itimerval set_buffer, get_buffer; int error; @@ -347,6 +277,6 @@ asmlinkage long sys_setitimer(int which, return error; if (copy_to_user(ovalue, &get_buffer, sizeof(get_buffer))) - return -EFAULT; + return -EFAULT; return 0; }