sched/cputime, powerpc: Remove cputime_to_scaled()

Currently cputime_to_scaled() just return it's argument on
all implementations, we don't need to call this function.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1479175612-14718-3-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/powerpc/include/asm/cputime.h

@@ -52,13 +52,6 @@ static inline unsigned long cputime_to_jiffies(const cputime_t ct)
 	return mulhdu((__force u64) ct, __cputime_jiffies_factor);
 }
 
-/* Estimate the scaled cputime by scaling the real cputime based on
- * the last scaled to real ratio */
-static inline cputime_t cputime_to_scaled(const cputime_t ct)
-{
-	return ct;
-}
-
 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
 {
 	u64 ct;

include/asm-generic/cputime_jiffies.h

@@ -7,7 +7,6 @@ typedef unsigned long __nocast cputime_t;
 
 #define cputime_one_jiffy		jiffies_to_cputime(1)
 #define cputime_to_jiffies(__ct)	(__force unsigned long)(__ct)
-#define cputime_to_scaled(__ct)		(__ct)
 #define jiffies_to_cputime(__hz)	(__force cputime_t)(__hz)
 
 typedef u64 __nocast cputime64_t;

include/asm-generic/cputime_nsecs.h

@@ -34,7 +34,6 @@ typedef u64 __nocast cputime64_t;
  */
 #define cputime_to_jiffies(__ct)	\
 	cputime_div(__ct, NSEC_PER_SEC / HZ)
-#define cputime_to_scaled(__ct)		(__ct)
 #define jiffies_to_cputime(__jif)	\
 	(__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
 #define cputime64_to_jiffies64(__ct)	\

kernel/sched/cputime.c

@@ -390,7 +390,7 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
 					 struct rq *rq, int ticks)
 {
 	u64 cputime = (__force u64) cputime_one_jiffy * ticks;
-	cputime_t scaled, other;
+	cputime_t other;
 
 	/*
 	 * When returning from idle, many ticks can get accounted at
@@ -403,7 +403,6 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
 	if (other >= cputime)
 		return;
 	cputime -= other;
-	scaled = cputime_to_scaled(cputime);
 
 	if (this_cpu_ksoftirqd() == p) {
 		/*
@@ -411,15 +410,15 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
 		 * So, we have to handle it separately here.
 		 * Also, p->stime needs to be updated for ksoftirqd.
 		 */
-		__account_system_time(p, cputime, scaled, CPUTIME_SOFTIRQ);
+		__account_system_time(p, cputime, cputime, CPUTIME_SOFTIRQ);
 	} else if (user_tick) {
-		account_user_time(p, cputime, scaled);
+		account_user_time(p, cputime, cputime);
 	} else if (p == rq->idle) {
 		account_idle_time(cputime);
 	} else if (p->flags & PF_VCPU) { /* System time or guest time */
-		account_guest_time(p, cputime, scaled);
+		account_guest_time(p, cputime, cputime);
 	} else {
-		__account_system_time(p, cputime, scaled,	CPUTIME_SYSTEM);
+		__account_system_time(p, cputime, cputime, CPUTIME_SYSTEM);
 	}
 }
 
@@ -502,7 +501,7 @@ void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime
  */
 void account_process_tick(struct task_struct *p, int user_tick)
 {
-	cputime_t cputime, scaled, steal;
+	cputime_t cputime, steal;
 	struct rq *rq = this_rq();
 
 	if (vtime_accounting_cpu_enabled())
@@ -520,12 +519,11 @@ void account_process_tick(struct task_struct *p, int user_tick)
 		return;
 
 	cputime -= steal;
-	scaled = cputime_to_scaled(cputime);
 
 	if (user_tick)
-		account_user_time(p, cputime, scaled);
+		account_user_time(p, cputime, cputime);
 	else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
-		account_system_time(p, HARDIRQ_OFFSET, cputime, scaled);
+		account_system_time(p, HARDIRQ_OFFSET, cputime, cputime);
 	else
 		account_idle_time(cputime);
 }
@@ -746,7 +744,7 @@ static void __vtime_account_system(struct task_struct *tsk)
 {
 	cputime_t delta_cpu = get_vtime_delta(tsk);
 
-	account_system_time(tsk, irq_count(), delta_cpu, cputime_to_scaled(delta_cpu));
+	account_system_time(tsk, irq_count(), delta_cpu, delta_cpu);
 }
 
 void vtime_account_system(struct task_struct *tsk)
@@ -767,7 +765,7 @@ void vtime_account_user(struct task_struct *tsk)
 	tsk->vtime_snap_whence = VTIME_SYS;
 	if (vtime_delta(tsk)) {
 		delta_cpu = get_vtime_delta(tsk);
-		account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
+		account_user_time(tsk, delta_cpu, delta_cpu);
 	}
 	write_seqcount_end(&tsk->vtime_seqcount);
 }
@@ -940,8 +938,8 @@ void task_cputime_scaled(struct task_struct *t,
 	fetch_task_cputime(t, utimescaled, stimescaled,
 			   &t->utimescaled, &t->stimescaled, &udelta, &sdelta);
 	if (utimescaled)
-		*utimescaled += cputime_to_scaled(udelta);
+		*utimescaled += udelta;
 	if (stimescaled)
-		*stimescaled += cputime_to_scaled(sdelta);
+		*stimescaled += sdelta;
 }
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */