This patch introduces the clock_getres64 method with timespec64 type for k_clock structure, that makes it ready for the 2038 year.

Convert to the 64bit method with timespec64 type for the clock_getres syscall function, and change the clock_getres syscall implementation according to the CONFIG_64BIT macro.

Also add a default 64bit method for the clock_getres64 pointer of k_clock structure, and it will be removed after all the drivers are converted to 64bit methods.

Signed-off-by: Baolin Wang baolin.wang@linaro.org --- include/linux/posix-timers.h | 1 + kernel/time/posix-timers.c | 38 ++++++++++++++++++++++++++++++++------ 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index be2123d..35786c5 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -98,6 +98,7 @@ struct k_itimer {

struct k_clock { int (*clock_getres) (const clockid_t which_clock, struct timespec *tp); + int (*clock_getres64) (const clockid_t which_clock, struct timespec64 *tp); int (*clock_set) (const clockid_t which_clock, const struct timespec *tp); int (*clock_set64) (const clockid_t which_clock, diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index a9e14cf..e0a6a09 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -567,6 +567,20 @@ static int default_clock_get64(const clockid_t which_clock, return ret; }

+static int default_clock_getres64(const clockid_t which_clock, + struct timespec64 *tp64) +{ + struct k_clock *kc = clockid_to_kclock(which_clock); + struct timespec tp; + int ret; + + ret = kc->clock_getres(which_clock, &tp); + if (!ret) + *tp64 = timespec_to_timespec64(tp); + + return 0; +} + void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock) { @@ -581,8 +595,8 @@ void posix_timers_register_clock(const clockid_t clock_id, clock_id); return; } - if (!new_clock->clock_getres) { - printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", + if (!new_clock->clock_getres && !new_clock->clock_getres64) { + printk(KERN_WARNING "POSIX clock id %d lacks clock_getres() and clock_getres64()\n", clock_id); return; } @@ -595,6 +609,8 @@ void posix_timers_register_clock(const clockid_t clock_id, new_clock->clock_set64 = default_clock_set64; if (new_clock->clock_get && !new_clock->clock_get64) new_clock->clock_get64 = default_clock_get64; + if (new_clock->clock_getres && !new_clock->clock_getres64) + new_clock->clock_getres64 = default_clock_getres64;

posix_clocks[clock_id] = *new_clock; } @@ -642,7 +658,8 @@ static struct k_clock *clockid_to_kclock(const clockid_t id) return (id & CLOCKFD_MASK) == CLOCKFD ? &clock_posix_dynamic : &clock_posix_cpu;

- if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) + if (id >= MAX_CLOCKS || (!posix_clocks[id].clock_getres + && !posix_clocks[id].clock_getres64)) return NULL; return &posix_clocks[id]; } @@ -1195,23 +1212,32 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, return err; }

-static int __clock_getres(clockid_t which_clock, struct timespec *ts) +static int __clock_getres(clockid_t which_clock, struct timespec64 *ts) { struct k_clock *kc = clockid_to_kclock(which_clock);

if (!kc) return -EINVAL;

- return kc->clock_getres(which_clock, ts); + return kc->clock_getres64(which_clock, ts); }

SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp) { - struct timespec rtn_tp; int error; +#ifdef CONFIG_64BIT + struct timespec64 rtn_tp;

error = __clock_getres(which_clock, &rtn_tp); +#else + struct timespec64 rtn_tp64; + struct timespec rtn_tp; + + error = __clock_getres(which_clock, &rtn_tp64); + if (!error) + rtn_tp = timespec64_to_timespec(rtn_tp64); +#endif

if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) error = -EFAULT;