asm-generic/io.h: suppress endianness warnings for readq() and writeq()

[ Upstream commit d564fa1ff1 ]

Commit c1d55d5013 ("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@arndb.de>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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