signal: Convert obsolete cputime type to nsecs

Use the new nsec based cputime accessors as part of the whole cputime
conversion from cputime_t to nsecs.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1485832191-26889-16-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/signal.c

@@ -1581,7 +1581,7 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
 	unsigned long flags;
 	struct sighand_struct *psig;
 	bool autoreap = false;
-	cputime_t utime, stime;
+	u64 utime, stime;
 
 	BUG_ON(sig == -1);
 
@@ -1619,9 +1619,9 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
 				       task_uid(tsk));
 	rcu_read_unlock();
 
-	task_cputime_t(tsk, &utime, &stime);
-	info.si_utime = cputime_to_clock_t(utime + nsecs_to_cputime(tsk->signal->utime));
-	info.si_stime = cputime_to_clock_t(stime + nsecs_to_cputime(tsk->signal->stime));
+	task_cputime(tsk, &utime, &stime);
+	info.si_utime = nsec_to_clock_t(utime + tsk->signal->utime);
+	info.si_stime = nsec_to_clock_t(stime + tsk->signal->stime);
 
 	info.si_status = tsk->exit_code & 0x7f;
 	if (tsk->exit_code & 0x80)
@@ -1685,7 +1685,7 @@ static void do_notify_parent_cldstop(struct task_struct *tsk,
 	unsigned long flags;
 	struct task_struct *parent;
 	struct sighand_struct *sighand;
-	cputime_t utime, stime;
+	u64 utime, stime;
 
 	if (for_ptracer) {
 		parent = tsk->parent;
@@ -1704,9 +1704,9 @@ static void do_notify_parent_cldstop(struct task_struct *tsk,
 	info.si_uid = from_kuid_munged(task_cred_xxx(parent, user_ns), task_uid(tsk));
 	rcu_read_unlock();
 
-	task_cputime_t(tsk, &utime, &stime);
-	info.si_utime = cputime_to_clock_t(utime);
-	info.si_stime = cputime_to_clock_t(stime);
+	task_cputime(tsk, &utime, &stime);
+	info.si_utime = nsec_to_clock_t(utime);
+	info.si_stime = nsec_to_clock_t(stime);
 
  	info.si_code = why;
  	switch (why) {