iommu/amd: Fix compile warning in init code

A recent commit introduced these compile warnings:

  CC      drivers/iommu/amd/init.o
drivers/iommu/amd/init.c:938:12: error: ‘iommu_init_ga_log’ defined but not used [-Werror=unused-function]
  938 | static int iommu_init_ga_log(struct amd_iommu *iommu)
      |            ^~~~~~~~~~~~~~~~~
drivers/iommu/amd/init.c:902:12: error: ‘iommu_ga_log_enable’ defined but not used [-Werror=unused-function]
  902 | static int iommu_ga_log_enable(struct amd_iommu *iommu)
      |            ^~~~~~~~~~~~~~~~~~~

The warnings appear because both functions are defined when IRQ
remapping is not enabled, but only used when IRQ remapping is enabled.

Fix it by only defining the functions when IRQ remapping is enabled.

Fixes: c5e1a1eb9279 ("iommu/amd: Simplify and Consolidate Virtual APIC (AVIC) Enablement")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20220729100432.22474-1-joro@8bytes.org

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 6bbaf6b971e875e9c13dbd7bef32889f7d28f709..fdc642362c1401dd21394fb14db9cd1b68404bb3 100644 (file)
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -899,9 +899,9 @@ static void free_ga_log(struct amd_iommu *iommu)
 #endif
 }
 
+#ifdef CONFIG_IRQ_REMAP
 static int iommu_ga_log_enable(struct amd_iommu *iommu)
 {
-#ifdef CONFIG_IRQ_REMAP
        u32 status, i;
        u64 entry;
 
@@ -931,13 +931,12 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
 
        if (WARN_ON(i >= LOOP_TIMEOUT))
                return -EINVAL;
-#endif /* CONFIG_IRQ_REMAP */
+
        return 0;
 }
 
 static int iommu_init_ga_log(struct amd_iommu *iommu)
 {
-#ifdef CONFIG_IRQ_REMAP
        if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
                return 0;
 
@@ -955,10 +954,8 @@ static int iommu_init_ga_log(struct amd_iommu *iommu)
 err_out:
        free_ga_log(iommu);
        return -EINVAL;
-#else
-       return 0;
-#endif /* CONFIG_IRQ_REMAP */
 }
+#endif /* CONFIG_IRQ_REMAP */
 
 static int __init alloc_cwwb_sem(struct amd_iommu *iommu)
 {