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posix-cpu-timers: Simplify sample functions 

All callers hand in a valdiated clock id. Remove the return value which was
unchecked in most places anyway.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192920.430475832@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-08-21 21:09:00 +02:00
parent 5405d0051f
commit 2092c1d4fe
1 changed files with 13 additions and 15 deletions
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28
kernel/time/posix-cpu-timers.c
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@ -180,14 +180,12 @@ posix_cpu_clock_set(const clockid_t clock, const struct timespec64 *tp)
}
/*
* Sample a per-thread clock for the given task.
* Sample a per-thread clock for the given task. clkid is validated.
*/
static int cpu_clock_sample(const clockid_t which_clock,
struct task_struct *p, u64 *sample)
static void cpu_clock_sample(const clockid_t clkid, struct task_struct *p,
u64 *sample)
{
switch (CPUCLOCK_WHICH(which_clock)) {
default:
return -EINVAL;
switch (clkid) {
case CPUCLOCK_PROF:
*sample = prof_ticks(p);
break;
@ -197,8 +195,9 @@ static int cpu_clock_sample(const clockid_t which_clock,
case CPUCLOCK_SCHED:
*sample = task_sched_runtime(p);
break;
default:
WARN_ON_ONCE(1);
}
return 0;
}
/*
@ -297,11 +296,11 @@ thread_group_start_cputime(struct task_struct *tsk, struct task_cputime *times)
* Sample a process (thread group) clock for the given task clkid. If the
* group's cputime accounting is already enabled, read the atomic
* store. Otherwise a full update is required. Task's sighand lock must be
* held to protect the task traversal on a full update.
* held to protect the task traversal on a full update. clkid is already
* validated.
*/
static int cpu_clock_sample_group(const clockid_t which_clock,
struct task_struct *p,
u64 *sample, bool start)
static void cpu_clock_sample_group(const clockid_t clkid, struct task_struct *p,
u64 *sample, bool start)
{
struct thread_group_cputimer *cputimer = &p->signal->cputimer;
struct task_cputime cputime;
@ -315,9 +314,7 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
sample_cputime_atomic(&cputime, &cputimer->cputime_atomic);
}
switch (CPUCLOCK_WHICH(which_clock)) {
default:
return -EINVAL;
switch (clkid) {
case CPUCLOCK_PROF:
*sample = cputime.utime + cputime.stime;
break;
@ -327,8 +324,9 @@ static int cpu_clock_sample_group(const clockid_t which_clock,
case CPUCLOCK_SCHED:
*sample = cputime.sum_exec_runtime;
break;
default:
WARN_ON_ONCE(1);
}
return 0;
}
static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp)