posix_cpu_timer: consolidate expiry time type

The posix cpu timer expiry time is stored in a union of two types: a 64
bits field if we rely on scheduler precise accounting, or a cputime_t if
we rely on jiffies.

This results in quite some duplicate code and special cases to handle the
two types.

Just unify this into a single 64 bits field.  cputime_t can always fit
into it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Olivier Langlois <olivier@trillion01.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 106 insertions, 160 deletions

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 42670e9b44e0..c3c4ea1225a4 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -51,59 +51,28 @@ static int check_clock(const clockid_t which_clock)
         return error;
 }
 
-static inline union cpu_time_count
+static inline unsigned long long
 timespec_to_sample(const clockid_t which_clock, const struct timespec *tp)
 {
-        union cpu_time_count ret;
-        ret.sched = 0;          /* high half always zero when .cpu used */
+        unsigned long long ret;
+
+        ret = 0;                /* high half always zero when .cpu used */
         if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-                ret.sched = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec;
+                ret = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec;
         } else {
-                ret.cpu = timespec_to_cputime(tp);
+                ret = cputime_to_expires(timespec_to_cputime(tp));
         }
         return ret;
 }
 
 static void sample_to_timespec(const clockid_t which_clock,
-                               union cpu_time_count cpu,
+                               unsigned long long expires,
                                struct timespec *tp)
 {
         if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED)
-                *tp = ns_to_timespec(cpu.sched);
+                *tp = ns_to_timespec(expires);
         else
-                cputime_to_timespec(cpu.cpu, tp);
-}
-
-static inline int cpu_time_before(const clockid_t which_clock,
-                                  union cpu_time_count now,
-                                  union cpu_time_count then)
-{
-        if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-                return now.sched < then.sched;
-        }  else {
-                return now.cpu < then.cpu;
-        }
-}
-static inline void cpu_time_add(const clockid_t which_clock,
-                                union cpu_time_count *acc,
-                                union cpu_time_count val)
-{
-        if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-                acc->sched += val.sched;
-        }  else {
-                acc->cpu += val.cpu;
-        }
-}
-static inline union cpu_time_count cpu_time_sub(const clockid_t which_clock,
-                                                union cpu_time_count a,
-                                                union cpu_time_count b)
-{
-        if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-                a.sched -= b.sched;
-        }  else {
-                a.cpu -= b.cpu;
-        }
-        return a;
+                cputime_to_timespec((__force cputime_t)expires, tp);
 }
 
 /*
@@ -111,47 +80,31 @@ static inline union cpu_time_count cpu_time_sub(const clockid_t which_clock,
  * given the current clock sample.
  */
 static void bump_cpu_timer(struct k_itimer *timer,
-                                  union cpu_time_count now)
+                           unsigned long long now)
 {
         int i;
+        unsigned long long delta, incr;
 
-        if (timer->it.cpu.incr.sched == 0)
+        if (timer->it.cpu.incr == 0)
                 return;
 
-        if (CPUCLOCK_WHICH(timer->it_clock) == CPUCLOCK_SCHED) {
-                unsigned long long delta, incr;
+        if (now < timer->it.cpu.expires)
+                return;
 
-                if (now.sched < timer->it.cpu.expires.sched)
-                        return;
-                incr = timer->it.cpu.incr.sched;
-                delta = now.sched + incr - timer->it.cpu.expires.sched;
-                /* Don't use (incr*2 < delta), incr*2 might overflow. */
-                for (i = 0; incr < delta - incr; i++)
-                        incr = incr << 1;
-                for (; i >= 0; incr >>= 1, i--) {
-                        if (delta < incr)
-                                continue;
-                        timer->it.cpu.expires.sched += incr;
-                        timer->it_overrun += 1 << i;
-                        delta -= incr;
-                }
-        } else {
-                cputime_t delta, incr;
+        incr = timer->it.cpu.incr;
+        delta = now + incr - timer->it.cpu.expires;
 
-                if (now.cpu < timer->it.cpu.expires.cpu)
-                        return;
-                incr = timer->it.cpu.incr.cpu;
-                delta = now.cpu + incr - timer->it.cpu.expires.cpu;
-                /* Don't use (incr*2 < delta), incr*2 might overflow. */
-                for (i = 0; incr < delta - incr; i++)
-                             incr += incr;
-                for (; i >= 0; incr = incr >> 1, i--) {
-                        if (delta < incr)
-                                continue;
-                        timer->it.cpu.expires.cpu += incr;
-                        timer->it_overrun += 1 << i;
-                        delta -= incr;
-                }
+        /* Don't use (incr*2 < delta), incr*2 might overflow. */
+        for (i = 0; incr < delta - incr; i++)
+                incr = incr << 1;
+
+        for (; i >= 0; incr >>= 1, i--) {
+                if (delta < incr)
+                        continue;
+
+                timer->it.cpu.expires += incr;
+                timer->it_overrun += 1 << i;
+                delta -= incr;
         }
 }
 
@@ -170,21 +123,21 @@ static inline int task_cputime_zero(const struct task_cputime *cputime)
         return 0;
 }
 
-static inline cputime_t prof_ticks(struct task_struct *p)
+static inline unsigned long long prof_ticks(struct task_struct *p)
 {
         cputime_t utime, stime;
 
         task_cputime(p, &utime, &stime);
 
-        return utime + stime;
+        return cputime_to_expires(utime + stime);
 }
-static inline cputime_t virt_ticks(struct task_struct *p)
+static inline unsigned long long virt_ticks(struct task_struct *p)
 {
         cputime_t utime;
 
         task_cputime(p, &utime, NULL);
 
-        return utime;
+        return cputime_to_expires(utime);
 }
 
 static int
@@ -225,19 +178,19 @@ posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp)
  * Sample a per-thread clock for the given task.
  */
 static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
-                            union cpu_time_count *cpu)
+                            unsigned long long *sample)
 {
         switch (CPUCLOCK_WHICH(which_clock)) {
         default:
                 return -EINVAL;
         case CPUCLOCK_PROF:
-                cpu->cpu = prof_ticks(p);
+                *sample = prof_ticks(p);
                 break;
         case CPUCLOCK_VIRT:
-                cpu->cpu = virt_ticks(p);
+                *sample = virt_ticks(p);
                 break;
         case CPUCLOCK_SCHED:
-                cpu->sched = task_sched_runtime(p);
+                *sample = task_sched_runtime(p);
                 break;
         }
         return 0;
@@ -284,7 +237,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
  */
 static int cpu_clock_sample_group(const clockid_t which_clock,
                                   struct task_struct *p,
-                                  union cpu_time_count *cpu)
+                                  unsigned long long *sample)
 {
         struct task_cputime cputime;
 
@@ -293,15 +246,15 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
                 return -EINVAL;
         case CPUCLOCK_PROF:
                 thread_group_cputime(p, &cputime);
-                cpu->cpu = cputime.utime + cputime.stime;
+                *sample = cputime_to_expires(cputime.utime + cputime.stime);
                 break;
         case CPUCLOCK_VIRT:
                 thread_group_cputime(p, &cputime);
-                cpu->cpu = cputime.utime;
+                *sample = cputime_to_expires(cputime.utime);
                 break;
         case CPUCLOCK_SCHED:
                 thread_group_cputime(p, &cputime);
-                cpu->sched = cputime.sum_exec_runtime;
+                *sample = cputime.sum_exec_runtime;
                 break;
         }
         return 0;
@@ -312,7 +265,7 @@ static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
 {
         const pid_t pid = CPUCLOCK_PID(which_clock);
         int error = -EINVAL;
-        union cpu_time_count rtn;
+        unsigned long long rtn;
 
         if (pid == 0) {
                 /*
@@ -461,30 +414,30 @@ static void cleanup_timers(struct list_head *head,
 
         list_for_each_entry_safe(timer, next, head, entry) {
                 list_del_init(&timer->entry);
-                if (timer->expires.cpu < ptime) {
-                        timer->expires.cpu = 0;
+                if (timer->expires < cputime_to_expires(ptime)) {
+                        timer->expires = 0;
                 } else {
-                        timer->expires.cpu -= ptime;
+                        timer->expires -= cputime_to_expires(ptime);
                 }
         }
 
         ++head;
         list_for_each_entry_safe(timer, next, head, entry) {
                 list_del_init(&timer->entry);
-                if (timer->expires.cpu < utime) {
-                        timer->expires.cpu = 0;
+                if (timer->expires < cputime_to_expires(utime)) {
+                        timer->expires = 0;
                 } else {
-                        timer->expires.cpu -= utime;
+                        timer->expires -= cputime_to_expires(utime);
                 }
         }
 
         ++head;
         list_for_each_entry_safe(timer, next, head, entry) {
                 list_del_init(&timer->entry);
-                if (timer->expires.sched < sum_exec_runtime) {
-                        timer->expires.sched = 0;
+                if (timer->expires < sum_exec_runtime) {
+                        timer->expires = 0;
                 } else {
-                        timer->expires.sched -= sum_exec_runtime;
+                        timer->expires -= sum_exec_runtime;
                 }
         }
 }
@@ -516,7 +469,7 @@ void posix_cpu_timers_exit_group(struct task_struct *tsk)
                        tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
 }
 
-static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
+static void clear_dead_task(struct k_itimer *timer, unsigned long long now)
 {
         /*
          * That's all for this thread or process.
@@ -524,9 +477,7 @@ static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
          */
         put_task_struct(timer->it.cpu.task);
         timer->it.cpu.task = NULL;
-        timer->it.cpu.expires = cpu_time_sub(timer->it_clock,
-                                             timer->it.cpu.expires,
-                                             now);
+        timer->it.cpu.expires -= now;
 }
 
 static inline int expires_gt(cputime_t expires, cputime_t new_exp)
@@ -558,14 +509,14 @@ static void arm_timer(struct k_itimer *timer)
 
         listpos = head;
         list_for_each_entry(next, head, entry) {
-                if (cpu_time_before(timer->it_clock, nt->expires, next->expires))
+                if (nt->expires < next->expires)
                         break;
                 listpos = &next->entry;
         }
         list_add(&nt->entry, listpos);
 
         if (listpos == head) {
-                union cpu_time_count *exp = &nt->expires;
+                unsigned long long exp = nt->expires;
 
                 /*
                  * We are the new earliest-expiring POSIX 1.b timer, hence
@@ -576,17 +527,17 @@ static void arm_timer(struct k_itimer *timer)
 
                 switch (CPUCLOCK_WHICH(timer->it_clock)) {
                 case CPUCLOCK_PROF:
-                        if (expires_gt(cputime_expires->prof_exp, exp->cpu))
-                                cputime_expires->prof_exp = exp->cpu;
+                        if (expires_gt(cputime_expires->prof_exp, expires_to_cputime(exp)))
+                                cputime_expires->prof_exp = expires_to_cputime(exp);
                         break;
                 case CPUCLOCK_VIRT:
-                        if (expires_gt(cputime_expires->virt_exp, exp->cpu))
-                                cputime_expires->virt_exp = exp->cpu;
+                        if (expires_gt(cputime_expires->virt_exp, expires_to_cputime(exp)))
+                                cputime_expires->virt_exp = expires_to_cputime(exp);
                         break;
                 case CPUCLOCK_SCHED:
                         if (cputime_expires->sched_exp == 0 ||
-                            cputime_expires->sched_exp > exp->sched)
-                                cputime_expires->sched_exp = exp->sched;
+                            cputime_expires->sched_exp > exp)
+                                cputime_expires->sched_exp = exp;
                         break;
                 }
         }
@@ -601,20 +552,20 @@ static void cpu_timer_fire(struct k_itimer *timer)
                 /*
                  * User don't want any signal.
                  */
-                timer->it.cpu.expires.sched = 0;
+                timer->it.cpu.expires = 0;
         } else if (unlikely(timer->sigq == NULL)) {
                 /*
                  * This a special case for clock_nanosleep,
                  * not a normal timer from sys_timer_create.
                  */
                 wake_up_process(timer->it_process);
-                timer->it.cpu.expires.sched = 0;
-        } else if (timer->it.cpu.incr.sched == 0) {
+                timer->it.cpu.expires = 0;
+        } else if (timer->it.cpu.incr == 0) {
                 /*
                  * One-shot timer.  Clear it as soon as it's fired.
                  */
                 posix_timer_event(timer, 0);
-                timer->it.cpu.expires.sched = 0;
+                timer->it.cpu.expires = 0;
         } else if (posix_timer_event(timer, ++timer->it_requeue_pending)) {
                 /*
                  * The signal did not get queued because the signal
@@ -632,7 +583,7 @@ static void cpu_timer_fire(struct k_itimer *timer)
  */
 static int cpu_timer_sample_group(const clockid_t which_clock,
                                   struct task_struct *p,
-                                  union cpu_time_count *cpu)
+                                  unsigned long long *sample)
 {
         struct task_cputime cputime;
 
@@ -641,13 +592,13 @@ static int cpu_timer_sample_group(const clockid_t which_clock,
         default:
                 return -EINVAL;
         case CPUCLOCK_PROF:
-                cpu->cpu = cputime.utime + cputime.stime;
+                *sample = cputime_to_expires(cputime.utime + cputime.stime);
                 break;
         case CPUCLOCK_VIRT:
-                cpu->cpu = cputime.utime;
+                *sample = cputime_to_expires(cputime.utime);
                 break;
         case CPUCLOCK_SCHED:
-                cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
+                *sample = cputime.sum_exec_runtime + task_delta_exec(p);
                 break;
         }
         return 0;
@@ -694,7 +645,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                                struct itimerspec *new, struct itimerspec *old)
 {
         struct task_struct *p = timer->it.cpu.task;
-        union cpu_time_count old_expires, new_expires, old_incr, val;
+        unsigned long long old_expires, new_expires, old_incr, val;
         int ret;
 
         if (unlikely(p == NULL)) {
@@ -749,7 +700,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
         }
 
         if (old) {
-                if (old_expires.sched == 0) {
+                if (old_expires == 0) {
                         old->it_value.tv_sec = 0;
                         old->it_value.tv_nsec = 0;
                 } else {
@@ -764,11 +715,8 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                          * new setting.
                          */
                         bump_cpu_timer(timer, val);
-                        if (cpu_time_before(timer->it_clock, val,
-                                            timer->it.cpu.expires)) {
-                                old_expires = cpu_time_sub(
-                                        timer->it_clock,
-                                        timer->it.cpu.expires, val);
+                        if (val < timer->it.cpu.expires) {
+                                old_expires = timer->it.cpu.expires - val;
                                 sample_to_timespec(timer->it_clock,
                                                    old_expires,
                                                    &old->it_value);
@@ -791,8 +739,8 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                 goto out;
         }
 
-        if (new_expires.sched != 0 && !(flags & TIMER_ABSTIME)) {
-                cpu_time_add(timer->it_clock, &new_expires, val);
+        if (new_expires != 0 && !(flags & TIMER_ABSTIME)) {
+                new_expires += val;
         }
 
         /*
@@ -801,8 +749,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
          * arm the timer (we'll just fake it for timer_gettime).
          */
         timer->it.cpu.expires = new_expires;
-        if (new_expires.sched != 0 &&
-            cpu_time_before(timer->it_clock, val, new_expires)) {
+        if (new_expires != 0 && val < new_expires) {
                 arm_timer(timer);
         }
 
@@ -826,8 +773,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
         timer->it_overrun_last = 0;
         timer->it_overrun = -1;
 
-        if (new_expires.sched != 0 &&
-            !cpu_time_before(timer->it_clock, val, new_expires)) {
+        if (new_expires != 0 && !(val < new_expires)) {
                 /*
                  * The designated time already passed, so we notify
                  * immediately, even if the thread never runs to
@@ -849,7 +795,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int flags,
 
 static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
 {
-        union cpu_time_count now;
+        unsigned long long now;
         struct task_struct *p = timer->it.cpu.task;
         int clear_dead;
 
@@ -859,7 +805,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
         sample_to_timespec(timer->it_clock,
                            timer->it.cpu.incr, &itp->it_interval);
 
-        if (timer->it.cpu.expires.sched == 0) { /* Timer not armed at all.  */
+        if (timer->it.cpu.expires == 0) {       /* Timer not armed at all.  */
                 itp->it_value.tv_sec = itp->it_value.tv_nsec = 0;
                 return;
         }
@@ -891,7 +837,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
                          */
                         put_task_struct(p);
                         timer->it.cpu.task = NULL;
-                        timer->it.cpu.expires.sched = 0;
+                        timer->it.cpu.expires = 0;
                         read_unlock(&tasklist_lock);
                         goto dead;
                 } else {
@@ -912,10 +858,9 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
                 goto dead;
         }
 
-        if (cpu_time_before(timer->it_clock, now, timer->it.cpu.expires)) {
+        if (now < timer->it.cpu.expires) {
                 sample_to_timespec(timer->it_clock,
-                                   cpu_time_sub(timer->it_clock,
-                                                timer->it.cpu.expires, now),
+                                   timer->it.cpu.expires - now,
                                    &itp->it_value);
         } else {
                 /*
@@ -946,8 +891,8 @@ static void check_thread_timers(struct task_struct *tsk,
                 struct cpu_timer_list *t = list_first_entry(timers,
                                                       struct cpu_timer_list,
                                                       entry);
-                if (!--maxfire || prof_ticks(tsk) < t->expires.cpu) {
-                        tsk->cputime_expires.prof_exp = t->expires.cpu;
+                if (!--maxfire || prof_ticks(tsk) < t->expires) {
+                        tsk->cputime_expires.prof_exp = expires_to_cputime(t->expires);
                         break;
                 }
                 t->firing = 1;
@@ -961,8 +906,8 @@ static void check_thread_timers(struct task_struct *tsk,
                 struct cpu_timer_list *t = list_first_entry(timers,
                                                       struct cpu_timer_list,
                                                       entry);
-                if (!--maxfire || virt_ticks(tsk) < t->expires.cpu) {
-                        tsk->cputime_expires.virt_exp = t->expires.cpu;
+                if (!--maxfire || virt_ticks(tsk) < t->expires) {
+                        tsk->cputime_expires.virt_exp = expires_to_cputime(t->expires);
                         break;
                 }
                 t->firing = 1;
@@ -976,8 +921,8 @@ static void check_thread_timers(struct task_struct *tsk,
                 struct cpu_timer_list *t = list_first_entry(timers,
                                                       struct cpu_timer_list,
                                                       entry);
-                if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
-                        tsk->cputime_expires.sched_exp = t->expires.sched;
+                if (!--maxfire || tsk->se.sum_exec_runtime < t->expires) {
+                        tsk->cputime_expires.sched_exp = t->expires;
                         break;
                 }
                 t->firing = 1;
@@ -1030,7 +975,8 @@ static void stop_process_timers(struct signal_struct *sig)
 static u32 onecputick;
 
 static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
-                             cputime_t *expires, cputime_t cur_time, int signo)
+                             unsigned long long *expires,
+                             unsigned long long cur_time, int signo)
 {
         if (!it->expires)
                 return;
@@ -1068,7 +1014,7 @@ static void check_process_timers(struct task_struct *tsk,
 {
         int maxfire;
         struct signal_struct *const sig = tsk->signal;
-        cputime_t utime, ptime, virt_expires, prof_expires;
+        unsigned long long utime, ptime, virt_expires, prof_expires;
         unsigned long long sum_sched_runtime, sched_expires;
         struct list_head *timers = sig->cpu_timers;
         struct task_cputime cputime;
@@ -1078,8 +1024,8 @@ static void check_process_timers(struct task_struct *tsk,
          * Collect the current process totals.
          */
         thread_group_cputimer(tsk, &cputime);
-        utime = cputime.utime;
-        ptime = utime + cputime.stime;
+        utime = cputime_to_expires(cputime.utime);
+        ptime = utime + cputime_to_expires(cputime.stime);
         sum_sched_runtime = cputime.sum_exec_runtime;
         maxfire = 20;
         prof_expires = 0;
@@ -1087,8 +1033,8 @@ static void check_process_timers(struct task_struct *tsk,
                 struct cpu_timer_list *tl = list_first_entry(timers,
                                                       struct cpu_timer_list,
                                                       entry);
-                if (!--maxfire || ptime < tl->expires.cpu) {
-                        prof_expires = tl->expires.cpu;
+                if (!--maxfire || ptime < tl->expires) {
+                        prof_expires = tl->expires;
                         break;
                 }
                 tl->firing = 1;
@@ -1102,8 +1048,8 @@ static void check_process_timers(struct task_struct *tsk,
                 struct cpu_timer_list *tl = list_first_entry(timers,
                                                       struct cpu_timer_list,
                                                       entry);
-                if (!--maxfire || utime < tl->expires.cpu) {
-                        virt_expires = tl->expires.cpu;
+                if (!--maxfire || utime < tl->expires) {
+                        virt_expires = tl->expires;
                         break;
                 }
                 tl->firing = 1;
@@ -1117,8 +1063,8 @@ static void check_process_timers(struct task_struct *tsk,
                 struct cpu_timer_list *tl = list_first_entry(timers,
                                                       struct cpu_timer_list,
                                                       entry);
-                if (!--maxfire || sum_sched_runtime < tl->expires.sched) {
-                        sched_expires = tl->expires.sched;
+                if (!--maxfire || sum_sched_runtime < tl->expires) {
+                        sched_expires = tl->expires;
                         break;
                 }
                 tl->firing = 1;
@@ -1162,8 +1108,8 @@ static void check_process_timers(struct task_struct *tsk,
                 }
         }
 
-        sig->cputime_expires.prof_exp = prof_expires;
-        sig->cputime_expires.virt_exp = virt_expires;
+        sig->cputime_expires.prof_exp = expires_to_cputime(prof_expires);
+        sig->cputime_expires.virt_exp = expires_to_cputime(virt_expires);
         sig->cputime_expires.sched_exp = sched_expires;
         if (task_cputime_zero(&sig->cputime_expires))
                 stop_process_timers(sig);
@@ -1176,7 +1122,7 @@ static void check_process_timers(struct task_struct *tsk,
 void posix_cpu_timer_schedule(struct k_itimer *timer)
 {
         struct task_struct *p = timer->it.cpu.task;
-        union cpu_time_count now;
+        unsigned long long now;
 
         if (unlikely(p == NULL))
                 /*
@@ -1205,7 +1151,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
                          */
                         put_task_struct(p);
                         timer->it.cpu.task = p = NULL;
-                        timer->it.cpu.expires.sched = 0;
+                        timer->it.cpu.expires = 0;
                         goto out_unlock;
                 } else if (unlikely(p->exit_state) && thread_group_empty(p)) {
                         /*
@@ -1387,7 +1333,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
                            cputime_t *newval, cputime_t *oldval)
 {
-        union cpu_time_count now;
+        unsigned long long now;
 
         BUG_ON(clock_idx == CPUCLOCK_SCHED);
         cpu_timer_sample_group(clock_idx, tsk, &now);
@@ -1399,17 +1345,17 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
                  * it to be absolute.
                  */
                 if (*oldval) {
-                        if (*oldval <= now.cpu) {
+                        if (*oldval <= now) {
                                 /* Just about to fire. */
                                 *oldval = cputime_one_jiffy;
                         } else {
-                                *oldval -= now.cpu;
+                                *oldval -= now;
                         }
                 }
 
                 if (!*newval)
                         goto out;
-                *newval += now.cpu;
+                *newval += now;
         }
 
         /*
@@ -1459,7 +1405,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
                 }
 
                 while (!signal_pending(current)) {
-                        if (timer.it.cpu.expires.sched == 0) {
+                        if (timer.it.cpu.expires == 0) {
                                 /*
                                  * Our timer fired and was reset, below
                                  * deletion can not fail.