hrtimer: Revert CLOCK_MONOTONIC_RAW support

Revert commits:
a6e707ddbdf1: KVM: arm/arm64: timer: Switch to CLOCK_MONOTONIC_RAW
9006a01829a5: hrtimer: Catch illegal clockids
9c808765e88e: hrtimer: Add support for CLOCK_MONOTONIC_RAW

Marc found out, that there are fundamental issues with that patch series
because __hrtimer_get_next_event() and hrtimer_forward() need support for
CLOCK_MONOTONIC_RAW. Nothing which is easily fixed, so revert the whole lot.

Reported-by: Marc Zyngier <marc.zyngier@arm.com>
Link: http://lkml.kernel.org/r/56D6CEF0.8060607@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/hrtimer.h

@@ -151,7 +151,6 @@ enum  hrtimer_base_type {
 	HRTIMER_BASE_REALTIME,
 	HRTIMER_BASE_BOOTTIME,
 	HRTIMER_BASE_TAI,
-	HRTIMER_BASE_MONOTONIC_RAW,
 	HRTIMER_MAX_CLOCK_BASES,
 };
 

kernel/time/hrtimer.c

@@ -90,30 +90,19 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
 			.clockid = CLOCK_TAI,
 			.get_time = &ktime_get_clocktai,
 		},
-		{
-			.index = HRTIMER_BASE_MONOTONIC_RAW,
-			.clockid = CLOCK_MONOTONIC_RAW,
-			.get_time = &ktime_get_raw,
-		},
 	}
 };
 
 static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
-	/* Make sure we catch unsupported clockids */
-	[0 ... MAX_CLOCKS - 1]	= HRTIMER_MAX_CLOCK_BASES,
-
 	[CLOCK_REALTIME]	= HRTIMER_BASE_REALTIME,
 	[CLOCK_MONOTONIC]	= HRTIMER_BASE_MONOTONIC,
-	[CLOCK_MONOTONIC_RAW]	= HRTIMER_BASE_MONOTONIC_RAW,
 	[CLOCK_BOOTTIME]	= HRTIMER_BASE_BOOTTIME,
 	[CLOCK_TAI]		= HRTIMER_BASE_TAI,
 };
 
 static inline int hrtimer_clockid_to_base(clockid_t clock_id)
 {
-	int base = hrtimer_clock_to_base_table[clock_id];
-	BUG_ON(base == HRTIMER_MAX_CLOCK_BASES);
-	return base;
+	return hrtimer_clock_to_base_table[clock_id];
 }
 
 /*
@@ -1279,10 +1268,7 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
 		if (!(active & 0x01))
 			continue;
 
-		if (unlikely(base->index == HRTIMER_BASE_MONOTONIC_RAW))
-			basenow = ktime_get_raw();
-		else
-			basenow = ktime_add(now, base->offset);
+		basenow = ktime_add(now, base->offset);
 
 		while ((node = timerqueue_getnext(&base->active))) {
 			struct hrtimer *timer;

virt/kvm/arm/arch_timer.c

@@ -48,7 +48,7 @@ static bool timer_is_armed(struct arch_timer_cpu *timer)
 static void timer_arm(struct arch_timer_cpu *timer, u64 ns)
 {
 	timer->armed = true;
-	hrtimer_start(&timer->timer, ktime_add_ns(ktime_get_raw(), ns),
+	hrtimer_start(&timer->timer, ktime_add_ns(ktime_get(), ns),
 		      HRTIMER_MODE_ABS);
 }
 
@@ -308,7 +308,7 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
 	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
 
 	INIT_WORK(&timer->expired, kvm_timer_inject_irq_work);
-	hrtimer_init(&timer->timer, CLOCK_MONOTONIC_RAW, HRTIMER_MODE_ABS);
+	hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 	timer->timer.function = kvm_timer_expire;
 }