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Subject[PATCH v3 3/4 -mmotm] copy_signal() cleanup: clean thread_group_cputime_init()
Remove unneeded initializations in thread_group_cputime_init() and
in posix_cpu_timers_init_group(). They are useless after
kmem_cache_zalloc() was used in copy_signal().

Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
---
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 23b26c7..c26bdb8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2434,9 +2434,7 @@ void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);

static inline void thread_group_cputime_init(struct signal_struct *sig)
{
- sig->cputimer.cputime = INIT_CPUTIME;
spin_lock_init(&sig->cputimer.lock);
- sig->cputimer.running = 0;
}

static inline void thread_group_cputime_free(struct signal_struct *sig)
diff --git a/kernel/fork.c b/kernel/fork.c
index 404e6ca..a9252bf 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -829,17 +829,6 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
/* Thread group counters. */
thread_group_cputime_init(sig);

- /* Expiration times and increments. */
- sig->it[CPUCLOCK_PROF].expires = cputime_zero;
- sig->it[CPUCLOCK_PROF].incr = cputime_zero;
- sig->it[CPUCLOCK_VIRT].expires = cputime_zero;
- sig->it[CPUCLOCK_VIRT].incr = cputime_zero;
-
- /* Cached expiration times. */
- sig->cputime_expires.prof_exp = cputime_zero;
- sig->cputime_expires.virt_exp = cputime_zero;
- sig->cputime_expires.sched_exp = 0;
-
cpu_limit = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
if (cpu_limit != RLIM_INFINITY) {
sig->cputime_expires.prof_exp = secs_to_cputime(cpu_limit);

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