linux-kernel - [PATCH] net: ethernet: mtk_eth_soc: use be32 type to store be32 values

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Message-Id: <20230401-mtk_eth_soc-sparse-v1-1-84e9fc7b8eab@kernel.org>
Date:   Sat, 01 Apr 2023 08:43:44 +0200
From:   Simon Horman <horms@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH] net: ethernet: mtk_eth_soc: use be32 type to store be32
 values

Perhaps there is a nicer way to handle this but the code
calls for converting an array of host byte order 32bit values
to big endian 32bit values: an ipv6 address to be pretty printed.

Use a sparse-friendly array of be32 to store these values.

Also make use of the cpu_to_be32_array helper rather
than open coding the conversion.

Flagged by sparse:
  drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c:59:27: warning: incorrect type in assignment (different base types)
  drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c:59:27:    expected unsigned int
  drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c:59:27:    got restricted __be32 [usertype]
  drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c:161:46: warning: cast to restricted __be16

No functional changes intended.
Compile tested only.

Signed-off-by: Simon Horman <horms@...nel.org>
---
 drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c b/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
index 53cf87e9acbb..1e0bb8cee7c4 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c
@@ -47,16 +47,14 @@ static const char *mtk_foe_pkt_type_str(int type)
 static void
 mtk_print_addr(struct seq_file *m, u32 *addr, bool ipv6)
 {
-	u32 n_addr[4];
-	int i;
+	__be32 n_addr[4];
 
 	if (!ipv6) {
 		seq_printf(m, "%pI4h", addr);
 		return;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(n_addr); i++)
-		n_addr[i] = htonl(addr[i]);
+	cpu_to_be32_array(n_addr, addr, 4);
 	seq_printf(m, "%pI6", n_addr);
 }