x86/hpet: Rename variables to prepare for switching to channels

struct hpet_dev is gone with the next change as the clockevent storage
moves into struct hpet_channel. So the variable name hdev will not make
sense anymore. Ditto for timer vs. channel and similar details.

Doing the rename in the change makes the patch harder to review. Doing it
afterward is problematic vs. tracking down issues. Doing it upfront is the
easiest solution as it does not change functionality.

Signed-off-by: Ingo Molnar <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Ingo Molnar <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ricardo Neri <[e-mail]>
Cc: Ashok Raj <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Suravee Suthikulpanit <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: Ravi Shankar <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]

arch/x86/kernel/hpet.c

···
 	pr_debug("Clockevent registered\n");
 }
 
-static int hpet_set_periodic(struct clock_event_device *evt, int timer)
+static int hpet_set_periodic(struct clock_event_device *evt, int channel)
 {
 	unsigned int cfg, cmp, now;
 	uint64_t delta;
···
 	delta >>= evt->shift;
 	now = hpet_readl(HPET_COUNTER);
 	cmp = now + (unsigned int)delta;
-	cfg = hpet_readl(HPET_Tn_CFG(timer));
+	cfg = hpet_readl(HPET_Tn_CFG(channel));
 	cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC | HPET_TN_SETVAL |
 	       HPET_TN_32BIT;
-	hpet_writel(cfg, HPET_Tn_CFG(timer));
-	hpet_writel(cmp, HPET_Tn_CMP(timer));
+	hpet_writel(cfg, HPET_Tn_CFG(channel));
+	hpet_writel(cmp, HPET_Tn_CMP(channel));
 	udelay(1);
 	/*
 	 * HPET on AMD 81xx needs a second write (with HPET_TN_SETVAL
···
 	 * (See AMD-8111 HyperTransport I/O Hub Data Sheet,
 	 * Publication # 24674)
 	 */
-	hpet_writel((unsigned int)delta, HPET_Tn_CMP(timer));
+	hpet_writel((unsigned int)delta, HPET_Tn_CMP(channel));
 	hpet_start_counter();
 	hpet_print_config();
 
 	return 0;
 }
 
-static int hpet_set_oneshot(struct clock_event_device *evt, int timer)
+static int hpet_set_oneshot(struct clock_event_device *evt, int channel)
 {
 	unsigned int cfg;
 
-	cfg = hpet_readl(HPET_Tn_CFG(timer));
+	cfg = hpet_readl(HPET_Tn_CFG(channel));
 	cfg &= ~HPET_TN_PERIODIC;
 	cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
-	hpet_writel(cfg, HPET_Tn_CFG(timer));
+	hpet_writel(cfg, HPET_Tn_CFG(channel));
 
 	return 0;
 }
 
-static int hpet_shutdown(struct clock_event_device *evt, int timer)
+static int hpet_shutdown(struct clock_event_device *evt, int channel)
 {
 	unsigned int cfg;
 
-	cfg = hpet_readl(HPET_Tn_CFG(timer));
+	cfg = hpet_readl(HPET_Tn_CFG(channel));
 	cfg &= ~HPET_TN_ENABLE;
-	hpet_writel(cfg, HPET_Tn_CFG(timer));
+	hpet_writel(cfg, HPET_Tn_CFG(channel));
 
 	return 0;
 }
···
 
 void hpet_msi_unmask(struct irq_data *data)
 {
-	struct hpet_dev *hdev = irq_data_get_irq_handler_data(data);
+	struct hpet_dev *hc = irq_data_get_irq_handler_data(data);
 	unsigned int cfg;
 
 	/* unmask it */
-	cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
+	cfg = hpet_readl(HPET_Tn_CFG(hc->num));
 	cfg |= HPET_TN_ENABLE | HPET_TN_FSB;
-	hpet_writel(cfg, HPET_Tn_CFG(hdev->num));
+	hpet_writel(cfg, HPET_Tn_CFG(hc->num));
 }
 
 void hpet_msi_mask(struct irq_data *data)
 {
-	struct hpet_dev *hdev = irq_data_get_irq_handler_data(data);
+	struct hpet_dev *hc = irq_data_get_irq_handler_data(data);
 	unsigned int cfg;
 
 	/* mask it */
-	cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
+	cfg = hpet_readl(HPET_Tn_CFG(hc->num));
 	cfg &= ~(HPET_TN_ENABLE | HPET_TN_FSB);
-	hpet_writel(cfg, HPET_Tn_CFG(hdev->num));
+	hpet_writel(cfg, HPET_Tn_CFG(hc->num));
 }
 
-void hpet_msi_write(struct hpet_dev *hdev, struct msi_msg *msg)
+void hpet_msi_write(struct hpet_dev *hc, struct msi_msg *msg)
 {
-	hpet_writel(msg->data, HPET_Tn_ROUTE(hdev->num));
-	hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hdev->num) + 4);
+	hpet_writel(msg->data, HPET_Tn_ROUTE(hc->num));
+	hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hc->num) + 4);
 }
 
 static int hpet_msi_shutdown(struct clock_event_device *evt)
···
 
 static int hpet_msi_resume(struct clock_event_device *evt)
 {
-	struct hpet_dev *hdev = clockevent_to_channel(evt);
-	struct irq_data *data = irq_get_irq_data(hdev->irq);
+	struct hpet_dev *hc = clockevent_to_channel(evt);
+	struct irq_data *data = irq_get_irq_data(hc->irq);
 	struct msi_msg msg;
 
 	/* Restore the MSI msg and unmask the interrupt */
 	irq_chip_compose_msi_msg(data, &msg);
-	hpet_msi_write(hdev, &msg);
+	hpet_msi_write(hc, &msg);
 	hpet_msi_unmask(data);
 	return 0;
 }
···
 
 static irqreturn_t hpet_interrupt_handler(int irq, void *data)
 {
-	struct hpet_dev *dev = data;
-	struct clock_event_device *evt = &dev->evt;
+	struct hpet_dev *hc = data;
+	struct clock_event_device *evt = &hc->evt;
 
 	if (!evt->event_handler) {
-		pr_info("Spurious interrupt HPET timer %d\n", dev->num);
+		pr_info("Spurious interrupt HPET channel %d\n", hc->num);
 		return IRQ_HANDLED;
 	}
 
···
 	return 0;
 }
 
-static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu)
+static void init_one_hpet_msi_clockevent(struct hpet_dev *hc, int cpu)
 {
-	struct clock_event_device *evt = &hdev->evt;
+	struct clock_event_device *evt = &hc->evt;
 
-	if (!(hdev->flags & HPET_DEV_VALID))
+	if (!(hc->flags & HPET_DEV_VALID))
 		return;
 
-	hdev->cpu = cpu;
-	per_cpu(cpu_hpet_dev, cpu) = hdev;
-	evt->name = hdev->name;
-	hpet_setup_irq(hdev);
-	evt->irq = hdev->irq;
+	hc->cpu = cpu;
+	per_cpu(cpu_hpet_dev, cpu) = hc;
+	evt->name = hc->name;
+	hpet_setup_irq(hc);
+	evt->irq = hc->irq;
 
 	evt->rating = 110;
 	evt->features = CLOCK_EVT_FEAT_ONESHOT;
-	if (hdev->flags & HPET_DEV_PERI_CAP) {
+	if (hc->flags & HPET_DEV_PERI_CAP) {
 		evt->features |= CLOCK_EVT_FEAT_PERIODIC;
 		evt->set_state_periodic = hpet_msi_set_periodic;
 	}
···
 	evt->set_state_oneshot = hpet_msi_set_oneshot;
 	evt->tick_resume = hpet_msi_resume;
 	evt->set_next_event = hpet_msi_next_event;
-	evt->cpumask = cpumask_of(hdev->cpu);
+	evt->cpumask = cpumask_of(hc->cpu);
 
 	clockevents_config_and_register(evt, hpet_freq, HPET_MIN_PROG_DELTA,
 					0x7FFFFFFF);
···
 		return NULL;
 
 	for (i = 0; i < hpet_base.nr_channels; i++) {
-		struct hpet_dev *hdev = &hpet_devs[i];
+		struct hpet_dev *hc = &hpet_devs[i];
 
-		if (!(hdev->flags & HPET_DEV_VALID))
+		if (!(hc->flags & HPET_DEV_VALID))
 			continue;
 		if (test_and_set_bit(HPET_DEV_USED_BIT,
-			(unsigned long *)&hdev->flags))
+			(unsigned long *)&hc->flags))
 			continue;
-		return hdev;
+		return hc;
 	}
 	return NULL;
 }
 
 static int hpet_cpuhp_online(unsigned int cpu)
 {
-	struct hpet_dev *hdev = hpet_get_unused_timer();
+	struct hpet_dev *hc = hpet_get_unused_timer();
 
-	if (hdev)
-		init_one_hpet_msi_clockevent(hdev, cpu);
+	if (hc)
+		init_one_hpet_msi_clockevent(hc, cpu);
 	return 0;
 }
 
 static int hpet_cpuhp_dead(unsigned int cpu)
 {
-	struct hpet_dev *hdev = per_cpu(cpu_hpet_dev, cpu);
+	struct hpet_dev *hc = per_cpu(cpu_hpet_dev, cpu);
 
-	if (!hdev)
+	if (!hc)
 		return 0;
-	free_irq(hdev->irq, hdev);
-	hdev->flags &= ~HPET_DEV_USED;
+	free_irq(hc->irq, hc);
+	hc->flags &= ~HPET_DEV_USED;
 	per_cpu(cpu_hpet_dev, cpu) = NULL;
 	return 0;
 }
···
 		return;
 
 	for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) {
-		struct hpet_dev *hdev = &hpet_devs[num_timers_used];
+		struct hpet_dev *hc = &hpet_devs[num_timers_used];
 		unsigned int cfg = hpet_base.channels[i].boot_cfg;
 
 		/* Only consider HPET timer with MSI support */
 		if (!(cfg & HPET_TN_FSB_CAP))
 			continue;
 
-		hdev->flags = 0;
+		hc->flags = 0;
 		if (cfg & HPET_TN_PERIODIC_CAP)
-			hdev->flags |= HPET_DEV_PERI_CAP;
-		sprintf(hdev->name, "hpet%d", i);
-		hdev->num = i;
+			hc->flags |= HPET_DEV_PERI_CAP;
+		sprintf(hc->name, "hpet%d", i);
+		hc->num = i;
 
-		irq = hpet_assign_irq(hpet_domain, hdev, hdev->num);
+		irq = hpet_assign_irq(hpet_domain, hc, hc->num);
 		if (irq <= 0)
 			continue;
 
-		hdev->irq = irq;
-		hdev->flags |= HPET_DEV_FSB_CAP;
-		hdev->flags |= HPET_DEV_VALID;
+		hc->irq = irq;
+		hc->flags |= HPET_DEV_FSB_CAP;
+		hc->flags |= HPET_DEV_VALID;
 		num_timers_used++;
 		if (num_timers_used == num_possible_cpus())
 			break;
···
 		return;
 
 	for (i = 0; i < hpet_base.nr_channels; i++) {
-		struct hpet_dev *hdev = &hpet_devs[i];
+		struct hpet_dev *hc = &hpet_devs[i];
 
-		if (!(hdev->flags & HPET_DEV_VALID))
+		if (!(hc->flags & HPET_DEV_VALID))
 			continue;
 
-		hd->hd_irq[hdev->num] = hdev->irq;
-		hpet_reserve_timer(hd, hdev->num);
+		hd->hd_irq[hc->num] = hc->irq;
+		hpet_reserve_timer(hd, hc->num);
 	}
 }
 #endif
···
 EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler);
 
 /*
- * Timer 1 for RTC emulation. We use one shot mode, as periodic mode
- * is not supported by all HPET implementations for timer 1.
+ * Channel 1 for RTC emulation. We use one shot mode, as periodic mode
+ * is not supported by all HPET implementations for channel 1.
  *
  * hpet_rtc_timer_init() is called when the rtc is initialized.
  */