Thread (7 messages) 7 messages, 3 authors, 2024-10-14
STALE650d REVIEWED: 8 (8M)

[PATCH net-next v2 1/3] net: ethernet: ti: am65-cpsw: Use __be64 type for id_temp

From: Simon Horman <horms@kernel.org>
Date: 2024-10-10 11:04:22
Also in: linux-omap, llvm
Subsystem: networking drivers, the rest · Maintainers: Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds

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.

Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Simon Horman <horms@kernel.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 12ccdd3f19aa..b08e2c3aeda3 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -3497,7 +3497,7 @@ 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
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