linux-kernel - [PATCH AUTOSEL 5.10 4/4] asm-generic/io.h: suppress endianness warnings for readq() and writeq()

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Message-Id: <20230413023746.74984-4-sashal@kernel.org>
Date:   Wed, 12 Apr 2023 22:37:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vladimir Oltean <vladimir.oltean@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sasha Levin <sashal@...nel.org>, linux-arch@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 4/4] asm-generic/io.h: suppress endianness warnings for readq() and writeq()

From: Vladimir Oltean <vladimir.oltean@....com>

[ Upstream commit d564fa1ff19e893e2971d66e5c8f49dc1cdc8ffc ]

Commit c1d55d50139b ("asm-generic/io.h: Fix sparse warnings on
big-endian architectures") missed fixing the 64-bit accessors.

Arnd explains in the attached link why the casts are necessary, even if
__raw_readq() and __raw_writeq() do not take endian-specific types.

Link: https://lore.kernel.org/lkml/9105d6fc-880b-4734-857d-e3d30b87ccf6@app.fastmail.com/
Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/asm-generic/io.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 9ea83d80eb6f9..dcbd41048b4e7 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -190,7 +190,7 @@ static inline u64 readq(const volatile void __iomem *addr)
 	u64 val;
 
 	__io_br();
-	val = __le64_to_cpu(__raw_readq(addr));
+	val = __le64_to_cpu((__le64 __force)__raw_readq(addr));
 	__io_ar(val);
 	return val;
 }
@@ -233,7 +233,7 @@ static inline void writel(u32 value, volatile void __iomem *addr)
 static inline void writeq(u64 value, volatile void __iomem *addr)
 {
 	__io_bw();
-	__raw_writeq(__cpu_to_le64(value), addr);
+	__raw_writeq((u64 __force)__cpu_to_le64(value), addr);
 	__io_aw();
 }
 #endif
-- 
2.39.2