powerpc/32s: Change mfsrin() into a static inline function

mfsrin() is a macro.

Change in into an inline function to avoid conflicts in KVM
and make it more evolutive.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/72c7b9879e2e2e6f5c27dadda6486386c2b50f23.1612612022.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/reg.h

@@ -1413,9 +1413,14 @@ static inline void msr_check_and_clear(unsigned long bits)
 }
 
 #ifdef CONFIG_PPC32
-#define mfsrin(v)	({unsigned int rval; \
-			asm volatile("mfsrin %0,%1" : "=r" (rval) : "r" (v)); \
-					rval;})
+static inline u32 mfsrin(u32 idx)
+{
+	u32 val;
+
+	asm volatile("mfsrin %0, %1" : "=r" (val): "r" (idx));
+
+	return val;
+}
 
 static inline void mtsrin(u32 val, u32 idx)
 {

arch/powerpc/kvm/book3s_emulate.c

@@ -61,10 +61,6 @@
 #define SPRN_GQR6		918
 #define SPRN_GQR7		919
 
-/* Book3S_32 defines mfsrin(v) - but that messes up our abstract
- * function pointers, so let's just disable the define. */
-#undef mfsrin
-
 enum priv_level {
 	PRIV_PROBLEM = 0,
 	PRIV_SUPER = 1,