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[PATCH] Yet more posix-cpu-timer fixes 

This just makes sure that a thread's expiry times can't get reset after
it clears them in do_exit.

This is what allowed us to re-introduce the stricter BUG_ON() check in
a362f463a6.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roland McGrath 2005-10-27 03:16:42 -07:00 committed by Linus Torvalds
parent a362f463a6
commit 72ab373a56
1 changed files with 7 additions and 4 deletions
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11
kernel/posix-cpu-timers.c
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@ -497,7 +497,7 @@ static void process_timer_rebalance(struct task_struct *p,
left = cputime_div(cputime_sub(expires.cpu, val.cpu),
nthreads);
do {
if (!unlikely(t->exit_state)) {
if (!unlikely(t->flags & PF_EXITING)) {
ticks = cputime_add(prof_ticks(t), left);
if (cputime_eq(t->it_prof_expires,
cputime_zero) ||
@ -512,7 +512,7 @@ static void process_timer_rebalance(struct task_struct *p,
left = cputime_div(cputime_sub(expires.cpu, val.cpu),
nthreads);
do {
if (!unlikely(t->exit_state)) {
if (!unlikely(t->flags & PF_EXITING)) {
ticks = cputime_add(virt_ticks(t), left);
if (cputime_eq(t->it_virt_expires,
cputime_zero) ||
@ -527,7 +527,7 @@ static void process_timer_rebalance(struct task_struct *p,
nsleft = expires.sched - val.sched;
do_div(nsleft, nthreads);
do {
if (!unlikely(t->exit_state)) {
if (!unlikely(t->flags & PF_EXITING)) {
ns = t->sched_time + nsleft;
if (t->it_sched_expires == 0 ||
t->it_sched_expires > ns) {
@ -566,6 +566,9 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
struct cpu_timer_list *next;
unsigned long i;
if (CPUCLOCK_PERTHREAD(timer->it_clock) && (p->flags & PF_EXITING))
return;
head = (CPUCLOCK_PERTHREAD(timer->it_clock) ?
p->cpu_timers : p->signal->cpu_timers);
head += CPUCLOCK_WHICH(timer->it_clock);
@ -1204,7 +1207,7 @@ static void check_process_timers(struct task_struct *tsk,
do {
t = next_thread(t);
} while (unlikely(t->exit_state));
} while (unlikely(t->flags & PF_EXITING));
} while (t != tsk);
}
}