linux-kernel - [PATCH v2] powerpc/powernv/pci: use ifdef to avoid dead code

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Date:   Sun, 14 Jun 2020 16:32:35 -0700
From:   Greg Thelen <gthelen@...gle.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Oliver O'Halloran" <oohall@...il.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Greg Thelen <gthelen@...gle.com>
Subject: [PATCH v2] powerpc/powernv/pci: use ifdef to avoid dead code

Commit dc3d8f85bb57 ("powerpc/powernv/pci: Re-work bus PE
configuration") removed a couple pnv_ioda_setup_bus_dma() calls.  The
only remaining calls are behind CONFIG_IOMMU_API.  Thus builds without
CONFIG_IOMMU_API see:
  arch/powerpc/platforms/powernv/pci-ioda.c:1888:13: error: 'pnv_ioda_setup_bus_dma' defined but not used

Move pnv_ioda_setup_bus_dma() under CONFIG_IOMMU_API to avoid dead code.

Fixes: dc3d8f85bb57 ("powerpc/powernv/pci: Re-work bus PE configuration")
Signed-off-by: Greg Thelen <gthelen@...gle.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 26 +++++++++++------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 73a63efcf855..743d840712da 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1885,19 +1885,6 @@ static bool pnv_pci_ioda_iommu_bypass_supported(struct pci_dev *pdev,
 	return false;
 }
 
-static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
-{
-	struct pci_dev *dev;
-
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
-		dev->dev.archdata.dma_offset = pe->tce_bypass_base;
-
-		if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
-			pnv_ioda_setup_bus_dma(pe, dev->subordinate);
-	}
-}
-
 static inline __be64 __iomem *pnv_ioda_get_inval_reg(struct pnv_phb *phb,
 						     bool real_mode)
 {
@@ -2501,6 +2488,19 @@ static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
 #endif
 
 #ifdef CONFIG_IOMMU_API
+static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
+		dev->dev.archdata.dma_offset = pe->tce_bypass_base;
+
+		if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
+			pnv_ioda_setup_bus_dma(pe, dev->subordinate);
+	}
+}
+
 unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift,
 		__u64 window_size, __u32 levels)
 {
-- 
2.27.0.290.gba653c62da-goog