netdev - [PATCH] sfc_ef100: Fix build failure on powerpc

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Message-Id: <44e26ec6a1bc01b5b138c29b623c83d5846718b2.1597329390.git.christophe.leroy@csgroup.eu>
Date:   Thu, 13 Aug 2020 14:39:10 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Edward Cree <ecree@...arflare.com>,
        Martin Habets <mhabets@...arflare.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        netdev@...r.kernel.org
Subject: [PATCH] sfc_ef100: Fix build failure on powerpc

ppc6xx_defconfig fails building sfc.ko module, complaining
about the lack of _umoddi3 symbol.

This is due to the following test

 		if (EFX_MIN_DMAQ_SIZE % reader->value) {

Because reader->value is u64.

As EFX_MIN_DMAQ_SIZE value is 512, reader->value is obviously small
enough for an u32 calculation, so cast it as (u32) for the test, to
avoid the need for _umoddi3.

Fixes: adcfc3482fff ("sfc_ef100: read Design Parameters at probe time")
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 drivers/net/ethernet/sfc/ef100_nic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index 36598d0542ed..234400b69b07 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -979,7 +979,7 @@ static int ef100_process_design_param(struct efx_nic *efx,
 		 * EFX_MIN_DMAQ_SIZE is divisible by GRANULARITY.
 		 * This is very unlikely to fail.
 		 */
-		if (EFX_MIN_DMAQ_SIZE % reader->value) {
+		if (EFX_MIN_DMAQ_SIZE % (u32)reader->value) {
 			netif_err(efx, probe, efx->net_dev,
 				  "%s size granularity is %llu, can't guarantee safety\n",
 				  reader->type == ESE_EF100_DP_GZ_RXQ_SIZE_GRANULARITY ? "RXQ" : "TXQ",
-- 
2.25.0