ia64: Convert vtime to use nsec units directly

There is no need anymore for this cputime_t midlayer. Let's use nsec
units directly.

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/1485832191-26889-30-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/ia64/kernel/head.S

@@ -1031,7 +1031,7 @@ GLOBAL_ENTRY(ia64_native_sched_clock)
 END(ia64_native_sched_clock)
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
-GLOBAL_ENTRY(cycle_to_cputime)
+GLOBAL_ENTRY(cycle_to_nsec)
 	alloc r16=ar.pfs,1,0,0,0
 	addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
 	;;
@@ -1047,7 +1047,7 @@ GLOBAL_ENTRY(cycle_to_cputime)
 	;;
 	shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
 	br.ret.sptk.many rp
-END(cycle_to_cputime)
+END(cycle_to_nsec)
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 
 #ifdef CONFIG_IA64_BRL_EMU

arch/ia64/kernel/time.c

@@ -60,7 +60,7 @@ static struct clocksource *itc_clocksource;
 
 #include <linux/kernel_stat.h>
 
-extern cputime_t cycle_to_cputime(u64 cyc);
+extern u64 cycle_to_nsec(u64 cyc);
 
 void vtime_flush(struct task_struct *tsk)
 {
@@ -68,26 +68,26 @@ void vtime_flush(struct task_struct *tsk)
 	u64 delta;
 
 	if (ti->utime)
-		account_user_time(tsk, cputime_to_nsecs(cycle_to_cputime(ti->utime)));
+		account_user_time(tsk, cycle_to_nsec(ti->utime));
 
 	if (ti->gtime)
-		account_guest_time(tsk, cputime_to_nsecs(cycle_to_cputime(ti->gtime)));
+		account_guest_time(tsk, cycle_to_nsec(ti->gtime));
 
 	if (ti->idle_time)
-		account_idle_time(cputime_to_nsecs(cycle_to_cputime(ti->idle_time)));
+		account_idle_time(cycle_to_nsec(ti->idle_time));
 
 	if (ti->stime) {
-		delta = cputime_to_nsecs(cycle_to_cputime(ti->stime));
+		delta = cycle_to_nsec(ti->stime);
 		account_system_index_time(tsk, delta, CPUTIME_SYSTEM);
 	}
 
 	if (ti->hardirq_time) {
-		delta = cputime_to_nsecs(cycle_to_cputime(ti->hardirq_time));
+		delta = cycle_to_nsec(ti->hardirq_time);
 		account_system_index_time(tsk, delta, CPUTIME_IRQ);
 	}
 
 	if (ti->softirq_time) {
-		delta = cputime_to_nsecs(cycle_to_cputime(ti->softirq_time));
+		delta = cycle_to_nsec(ti->softirq_time));
 		account_system_index_time(tsk, delta, CPUTIME_SOFTIRQ);
 	}