iommu/amd: Fix compile error for unused function

Recent changes introduced a compile error:

drivers/iommu/amd/iommu.c:1285:13: error: ‘iommu_flush_irt_and_complete’ defined but not used [-Werror=unused-function]
 1285 | static void iommu_flush_irt_and_complete(struct amd_iommu *iommu, u16 devid)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

This happens with defconfig-x86_64 because AMD IOMMU is enabled but
CONFIG_IRQ_REMAP is disabled. Move the function under #ifdef
CONFIG_IRQ_REMAP to fix the error.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: joergroedel

drivers/iommu/amd/iommu.c

@@ -1275,32 +1275,6 @@ static void amd_iommu_flush_irt_all(struct amd_iommu *iommu)
 	iommu_completion_wait(iommu);
 }
 
-static void iommu_flush_irt_and_complete(struct amd_iommu *iommu, u16 devid)
-{
-	int ret;
-	u64 data;
-	unsigned long flags;
-	struct iommu_cmd cmd, cmd2;
-
-	if (iommu->irtcachedis_enabled)
-		return;
-
-	build_inv_irt(&cmd, devid);
-	data = atomic64_add_return(1, &iommu->cmd_sem_val);
-	build_completion_wait(&cmd2, iommu, data);
-
-	raw_spin_lock_irqsave(&iommu->lock, flags);
-	ret = __iommu_queue_command_sync(iommu, &cmd, true);
-	if (ret)
-		goto out;
-	ret = __iommu_queue_command_sync(iommu, &cmd2, false);
-	if (ret)
-		goto out;
-	wait_on_sem(iommu, data);
-out:
-	raw_spin_unlock_irqrestore(&iommu->lock, flags);
-}
-
 void iommu_flush_all_caches(struct amd_iommu *iommu)
 {
 	if (iommu_feature(iommu, FEATURE_IA)) {
@@ -2831,6 +2805,32 @@ EXPORT_SYMBOL(amd_iommu_device_info);
 static struct irq_chip amd_ir_chip;
 static DEFINE_SPINLOCK(iommu_table_lock);
 
+static void iommu_flush_irt_and_complete(struct amd_iommu *iommu, u16 devid)
+{
+	int ret;
+	u64 data;
+	unsigned long flags;
+	struct iommu_cmd cmd, cmd2;
+
+	if (iommu->irtcachedis_enabled)
+		return;
+
+	build_inv_irt(&cmd, devid);
+	data = atomic64_add_return(1, &iommu->cmd_sem_val);
+	build_completion_wait(&cmd2, iommu, data);
+
+	raw_spin_lock_irqsave(&iommu->lock, flags);
+	ret = __iommu_queue_command_sync(iommu, &cmd, true);
+	if (ret)
+		goto out;
+	ret = __iommu_queue_command_sync(iommu, &cmd2, false);
+	if (ret)
+		goto out;
+	wait_on_sem(iommu, data);
+out:
+	raw_spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
 static void set_dte_irq_entry(struct amd_iommu *iommu, u16 devid,
 			      struct irq_remap_table *table)
 {