netdev - [PATCH net-next 2/3] net: ethernet: ti: am65-cpsw: Use __be64 type for id

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Message-Id: <20240910-ti-warn-v1-2-afd1e404abbe@kernel.org>
Date: Tue, 10 Sep 2024 08:17:57 +0100
From: Simon Horman <horms@...nel.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Siddharth Vadapalli <s-vadapalli@...com>, 
 Roger Quadros <rogerq@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: netdev@...r.kernel.org, linux-omap@...r.kernel.org, 
 llvm@...ts.linux.dev
Subject: [PATCH net-next 2/3] net: ethernet: ti: am65-cpsw: Use __be64 type
 for id_temp

The id_temp local variable in am65_cpsw_nuss_probe() is
used to hold a 64-bit big-endian value as it is assigned using
cpu_to_be64().

It is read using memcpy(), where it is written as an identifier into a
byte-array.  So this can also be treated as big endian.

As it's type is currently host byte order (u64), sparse flags
an endian mismatch when compiling for little-endian systems:

.../am65-cpsw-nuss.c:3454:17: warning: incorrect type in assignment (different base types)
.../am65-cpsw-nuss.c:3454:17:    expected unsigned long long [usertype] id_temp
.../am65-cpsw-nuss.c:3454:17:    got restricted __be64 [usertype]

Address this by using __be64 as the type of id_temp.

No functional change intended.
Compile tested only.

Signed-off-by: Simon Horman <horms@...nel.org>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index a4b0e4bb7529..9e6353e0361e 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -3444,7 +3444,7 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct clk *clk;
 	int ale_entries;
-	u64 id_temp;
+	__be64 id_temp;
 	int ret, i;

 	common = devm_kzalloc(dev, sizeof(struct am65_cpsw_common), GFP_KERNEL);

-- 
2.45.2