diff options
Diffstat (limited to 'kernel/time/posix-cpu-timers.c')
| -rw-r--r-- | kernel/time/posix-cpu-timers.c | 57 |
1 files changed, 14 insertions, 43 deletions
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index b06ed8b14861..eb11117bf227 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -289,53 +289,24 @@ static int cpu_clock_sample_group(const clockid_t which_clock, return 0; } -static int posix_cpu_clock_get_task(struct task_struct *tsk, - const clockid_t which_clock, - struct timespec64 *tp) +static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp) { - int err = -EINVAL; - u64 rtn; - - if (CPUCLOCK_PERTHREAD(which_clock)) { - if (same_thread_group(tsk, current)) - err = cpu_clock_sample(which_clock, tsk, &rtn); - } else { - if (tsk == current || thread_group_leader(tsk)) - err = cpu_clock_sample_group(which_clock, tsk, &rtn); - } - - if (!err) - *tp = ns_to_timespec64(rtn); + const clockid_t clkid = CPUCLOCK_WHICH(clock); + struct task_struct *tsk; + u64 t; - return err; -} - - -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; + tsk = get_task_for_clock(clock); + if (!tsk) + return -EINVAL; - if (pid == 0) { - /* - * Special case constant value for our own clocks. - * We don't have to do any lookup to find ourselves. - */ - err = posix_cpu_clock_get_task(current, which_clock, tp); - } else { - /* - * Find the given PID, and validate that the caller - * should be able to see it. - */ - struct task_struct *p; - rcu_read_lock(); - p = find_task_by_vpid(pid); - if (p) - err = posix_cpu_clock_get_task(p, which_clock, tp); - rcu_read_unlock(); - } + if (CPUCLOCK_PERTHREAD(clock)) + cpu_clock_sample(clkid, tsk, &t); + else + cpu_clock_sample_group(clkid, tsk, &t); + put_task_struct(tsk); - return err; + *tp = ns_to_timespec64(t); + return 0; } /* |