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posix-cpu-timers: Move state tracking to struct posix_cputimers

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Put it where it belongs and clean up the ifdeffery in fork completely.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190821192922.743229404@linutronix.de
This commit is contained in:
Thomas Gleixner
2019-08-21 21:09:24 +02:00
parent 8991afe264
commit 244d49e306
6 changed files with 54 additions and 50 deletions
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9
include/linux/sched/cputime.h
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@@ -70,7 +70,7 @@ void thread_group_sample_cputime(struct task_struct *tsk, u64 *samples);
*/
/**
* get_running_cputimer - return &tsk->signal->cputimer if cputimer is running
* get_running_cputimer - return &tsk->signal->cputimer if cputimers are active
*
* @tsk: Pointer to target task.
*/
@@ -80,8 +80,11 @@ struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk)
{
struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
/* Check if cputimer isn't running. This is accessed without locking. */
if (!READ_ONCE(cputimer->running))
/*
* Check whether posix CPU timers are active. If not the thread
* group accounting is not active either. Lockless check.
*/
if (!READ_ONCE(tsk->signal->posix_cputimers.timers_active))
return NULL;
/*