This patch changes to the new 64bit methods with timespec64/itimerspec64 type for the k_clock structure in posix-cpu-timers.c file, that makes it ready for 2038 issue.

Signed-off-by: Baolin Wang baolin.wang@linaro.org --- kernel/time/posix-cpu-timers.c | 84 +++++++++++++++++++++------------------- 1 file changed, 45 insertions(+), 39 deletions(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index 0075da7..5a4c056 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -52,7 +52,7 @@ static int check_clock(const clockid_t which_clock) }

static inline unsigned long long -timespec_to_sample(const clockid_t which_clock, const struct timespec *tp) +timespec64_to_sample(const clockid_t which_clock, const struct timespec64 *tp) { unsigned long long ret;

@@ -60,19 +60,19 @@ timespec_to_sample(const clockid_t which_clock, const struct timespec *tp) if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { ret = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec; } else { - ret = cputime_to_expires(timespec_to_cputime(tp)); + ret = cputime_to_expires(timespec64_to_cputime(tp)); } return ret; }

-static void sample_to_timespec(const clockid_t which_clock, +static void sample_to_timespec64(const clockid_t which_clock, unsigned long long expires, - struct timespec *tp) + struct timespec64 *tp) { if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) - *tp = ns_to_timespec(expires); + *tp = ns_to_timespec64(expires); else - cputime_to_timespec((__force cputime_t)expires, tp); + cputime_to_timespec64((__force cputime_t)expires, tp); }

/* @@ -141,7 +141,7 @@ static inline unsigned long long virt_ticks(struct task_struct *p) }

static int -posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) +posix_cpu_clock_getres(const clockid_t which_clock, struct timespec64 *tp) { int error = check_clock(which_clock); if (!error) { @@ -160,7 +160,7 @@ posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) }

static int -posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp) +posix_cpu_clock_set(const clockid_t which_clock, const struct timespec64 *tp) { /* * You can never reset a CPU clock, but we check for other errors @@ -263,7 +263,7 @@ static int cpu_clock_sample_group(const clockid_t which_clock,

static int posix_cpu_clock_get_task(struct task_struct *tsk, const clockid_t which_clock, - struct timespec *tp) + struct timespec64 *tp) { int err = -EINVAL; unsigned long long rtn; @@ -277,13 +277,14 @@ static int posix_cpu_clock_get_task(struct task_struct *tsk, }

if (!err) - sample_to_timespec(which_clock, rtn, tp); + sample_to_timespec64(which_clock, rtn, tp);

return err; }

-static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) +static int posix_cpu_clock_get(const clockid_t which_clock, + struct timespec64 *tp) { const pid_t pid = CPUCLOCK_PID(which_clock); int err = -EINVAL; @@ -598,7 +599,7 @@ static inline void posix_cpu_timer_kick_nohz(void) { } * and try again. (This happens when the timer is in the middle of firing.) */ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags, - struct itimerspec *new, struct itimerspec *old) + struct itimerspec64 *new, struct itimerspec64 *old) { unsigned long flags; struct sighand_struct *sighand; @@ -608,7 +609,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,

WARN_ON_ONCE(p == NULL);

- new_expires = timespec_to_sample(timer->it_clock, &new->it_value); + new_expires = timespec64_to_sample(timer->it_clock, &new->it_value);

/* * Protect against sighand release/switch in exit/exec and p->cpu_timers @@ -669,7 +670,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags, bump_cpu_timer(timer, val); if (val < timer->it.cpu.expires) { old_expires = timer->it.cpu.expires - val; - sample_to_timespec(timer->it_clock, + sample_to_timespec64(timer->it_clock, old_expires, &old->it_value); } else { @@ -709,7 +710,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags, * Install the new reload setting, and * set up the signal and overrun bookkeeping. */ - timer->it.cpu.incr = timespec_to_sample(timer->it_clock, + timer->it.cpu.incr = timespec64_to_sample(timer->it_clock, &new->it_interval);

/* @@ -734,7 +735,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags, ret = 0; out: if (old) { - sample_to_timespec(timer->it_clock, + sample_to_timespec64(timer->it_clock, old_incr, &old->it_interval); } if (!ret) @@ -742,7 +743,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags, return ret; }

-static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) +static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp) { unsigned long long now; struct task_struct *p = timer->it.cpu.task; @@ -752,7 +753,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) /* * Easy part: convert the reload time. */ - sample_to_timespec(timer->it_clock, + sample_to_timespec64(timer->it_clock, timer->it.cpu.incr, &itp->it_interval);

if (timer->it.cpu.expires == 0) { /* Timer not armed at all. */ @@ -782,7 +783,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) * Call the timer disarmed, nothing else to do. */ timer->it.cpu.expires = 0; - sample_to_timespec(timer->it_clock, timer->it.cpu.expires, + sample_to_timespec64(timer->it_clock, timer->it.cpu.expires, &itp->it_value); } else { cpu_timer_sample_group(timer->it_clock, p, &now); @@ -791,7 +792,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) }

if (now < timer->it.cpu.expires) { - sample_to_timespec(timer->it_clock, + sample_to_timespec64(timer->it_clock, timer->it.cpu.expires - now, &itp->it_value); } else { @@ -1248,6 +1249,8 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags, struct timespec *rqtp, struct itimerspec *it) { struct k_itimer timer; + struct timespec64 ts64; + struct itimerspec64 it64; int error;

/* @@ -1260,13 +1263,14 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags, error = posix_cpu_timer_create(&timer); timer.it_process = current; if (!error) { - static struct itimerspec zero_it; + static struct itimerspec64 zero_it;

memset(it, 0, sizeof *it); it->it_value = *rqtp;

spin_lock_irq(&timer.it_lock); - error = posix_cpu_timer_set(&timer, flags, it, NULL); + it64 = itimerspec_to_itimerspec64(it); + error = posix_cpu_timer_set(&timer, flags, &it64, NULL); if (error) { spin_unlock_irq(&timer.it_lock); return error; @@ -1295,13 +1299,15 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags, /* * We were interrupted by a signal. */ - sample_to_timespec(which_clock, timer.it.cpu.expires, rqtp); - error = posix_cpu_timer_set(&timer, 0, &zero_it, it); + sample_to_timespec64(which_clock, timer.it.cpu.expires, &ts64); + *rqtp = timespec64_to_timespec(ts64); + error = posix_cpu_timer_set(&timer, 0, &zero_it, &it64); if (!error) { /* * Timer is now unarmed, deletion can not fail. */ posix_cpu_timer_del(&timer); + *it = itimerspec64_to_itimerspec(&it64); } spin_unlock_irq(&timer.it_lock);

@@ -1395,12 +1401,12 @@ static long posix_cpu_nsleep_restart(struct restart_block *restart_block) #define THREAD_CLOCK MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED)

static int process_cpu_clock_getres(const clockid_t which_clock, - struct timespec *tp) + struct timespec64 *tp) { return posix_cpu_clock_getres(PROCESS_CLOCK, tp); } static int process_cpu_clock_get(const clockid_t which_clock, - struct timespec *tp) + struct timespec64 *tp) { return posix_cpu_clock_get(PROCESS_CLOCK, tp); } @@ -1420,12 +1426,12 @@ static long process_cpu_nsleep_restart(struct restart_block *restart_block) return -EINVAL; } static int thread_cpu_clock_getres(const clockid_t which_clock, - struct timespec *tp) + struct timespec64 *tp) { return posix_cpu_clock_getres(THREAD_CLOCK, tp); } static int thread_cpu_clock_get(const clockid_t which_clock, - struct timespec *tp) + struct timespec64 *tp) { return posix_cpu_clock_get(THREAD_CLOCK, tp); } @@ -1436,37 +1442,37 @@ static int thread_cpu_timer_create(struct k_itimer *timer) }

struct k_clock clock_posix_cpu = { - .clock_getres = posix_cpu_clock_getres, - .clock_set = posix_cpu_clock_set, - .clock_get = posix_cpu_clock_get, + .clock_getres64 = posix_cpu_clock_getres, + .clock_set64 = posix_cpu_clock_set, + .clock_get64 = posix_cpu_clock_get, .timer_create = posix_cpu_timer_create, .nsleep = posix_cpu_nsleep, .nsleep_restart = posix_cpu_nsleep_restart, - .timer_set = posix_cpu_timer_set, + .timer_set64 = posix_cpu_timer_set, .timer_del = posix_cpu_timer_del, - .timer_get = posix_cpu_timer_get, + .timer_get64 = posix_cpu_timer_get, };

static __init int init_posix_cpu_timers(void) { struct k_clock process = { - .clock_getres = process_cpu_clock_getres, - .clock_get = process_cpu_clock_get, + .clock_getres64 = process_cpu_clock_getres, + .clock_get64 = process_cpu_clock_get, .timer_create = process_cpu_timer_create, .nsleep = process_cpu_nsleep, .nsleep_restart = process_cpu_nsleep_restart, }; struct k_clock thread = { - .clock_getres = thread_cpu_clock_getres, - .clock_get = thread_cpu_clock_get, + .clock_getres64 = thread_cpu_clock_getres, + .clock_get64 = thread_cpu_clock_get, .timer_create = thread_cpu_timer_create, }; - struct timespec ts; + struct timespec64 ts;

posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process); posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread);

- cputime_to_timespec(cputime_one_jiffy, &ts); + cputime_to_timespec64(cputime_one_jiffy, &ts); onecputick = ts.tv_nsec; WARN_ON(ts.tv_sec != 0);