linux-kernel - [PATCH v3 3/4 -mmotm] copy_signal() cleanup: clean thread_group_cputime

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Message-ID: <20091215101959.GD9134@darkmag.usersys.redhat.com>
Date:	Tue, 15 Dec 2009 11:19:59 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Miloslav Trmac <mitr@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Alan Cox <alan@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Renaud Lottiaux <renaud.lottiaux@...labs.com>,
	Louis Rilling <louis.rilling@...labs.com>,
	David Howells <dhowells@...hat.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>
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@...hat.com>
Acked-by: Oleg Nesterov <oleg@...hat.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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