netdev - [PATCH net] sfc: fix build warnings on 32-bit

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Date:   Thu, 20 Aug 2020 11:47:19 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <rdunlap@...radead.org>
Subject: [PATCH net] sfc: fix build warnings on 32-bit

Truncation of DMA_BIT_MASK to 32-bit dma_addr_t is semantically safe,
 but the compiler was warning because it was happening implicitly.
Insert explicit casts to suppress the warnings.

Reported-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/ef100.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef100.c b/drivers/net/ethernet/sfc/ef100.c
index 9729983f4840..c54b7f8243f3 100644
--- a/drivers/net/ethernet/sfc/ef100.c
+++ b/drivers/net/ethernet/sfc/ef100.c
@@ -142,7 +142,7 @@ static int ef100_pci_parse_continue_entry(struct efx_nic *efx, int entry_locatio
 
 		/* Temporarily map new BAR. */
 		rc = efx_init_io(efx, bar,
-				 DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
+				 (dma_addr_t)DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
 				 pci_resource_len(efx->pci_dev, bar));
 		if (rc) {
 			netif_err(efx, probe, efx->net_dev,
@@ -160,7 +160,7 @@ static int ef100_pci_parse_continue_entry(struct efx_nic *efx, int entry_locatio
 
 		/* Put old BAR back. */
 		rc = efx_init_io(efx, previous_bar,
-				 DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
+				 (dma_addr_t)DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
 				 pci_resource_len(efx->pci_dev, previous_bar));
 		if (rc) {
 			netif_err(efx, probe, efx->net_dev,
@@ -334,7 +334,7 @@ static int ef100_pci_parse_xilinx_cap(struct efx_nic *efx, int vndr_cap,
 
 	/* Temporarily map BAR. */
 	rc = efx_init_io(efx, bar,
-			 DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
+			 (dma_addr_t)DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
 			 pci_resource_len(efx->pci_dev, bar));
 	if (rc) {
 		netif_err(efx, probe, efx->net_dev,
@@ -495,7 +495,7 @@ static int ef100_pci_probe(struct pci_dev *pci_dev,
 
 	/* Set up basic I/O (BAR mappings etc) */
 	rc = efx_init_io(efx, fcw.bar,
-			 DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
+			 (dma_addr_t)DMA_BIT_MASK(ESF_GZ_TX_SEND_ADDR_WIDTH),
 			 pci_resource_len(efx->pci_dev, fcw.bar));
 	if (rc)
 		goto fail;