sparc64: implement ioremap_uc

commit 38e45d8 upstream.

On sparc64, the whole physical IO address space is accessible using
physically addressed loads and stores. *_uc does nothing like the
others.

Cc: <[email protected]> # v4.19+
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Tuowen Zhao <[email protected]>
Acked-by: David S. Miller <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

arch/sparc/include/asm/io_64.h

@@ -407,6 +407,7 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 }
 
 #define ioremap_nocache(X,Y)		ioremap((X),(Y))
+#define ioremap_uc(X,Y)			ioremap((X),(Y))
 #define ioremap_wc(X,Y)			ioremap((X),(Y))
 #define ioremap_wt(X,Y)			ioremap((X),(Y))