x86/hpet: Remove the unused hpet_msi_read() function

No users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Link: https://lkml.kernel.org/r/20190623132434.553729327@linutronix.de

arch/x86/include/asm/hpet.h

@@ -81,7 +81,6 @@ struct irq_domain;
 extern void hpet_msi_unmask(struct irq_data *data);
 extern void hpet_msi_mask(struct irq_data *data);
 extern void hpet_msi_write(struct hpet_dev *hdev, struct msi_msg *msg);
-extern void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg);
 extern struct irq_domain *hpet_create_irq_domain(int hpet_id);
 extern int hpet_assign_irq(struct irq_domain *domain,
 			   struct hpet_dev *dev, int dev_num);

arch/x86/kernel/hpet.c

@@ -462,13 +462,6 @@ void hpet_msi_write(struct hpet_dev *hdev, struct msi_msg *msg)
 	hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hdev->num) + 4);
 }
 
-void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg)
-{
-	msg->data = hpet_readl(HPET_Tn_ROUTE(hdev->num));
-	msg->address_lo = hpet_readl(HPET_Tn_ROUTE(hdev->num) + 4);
-	msg->address_hi = 0;
-}
-
 static int hpet_msi_shutdown(struct clock_event_device *evt)
 {
 	struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);