powerpc/xive: Remove (almost) unused macros

The GETFIELD and SETFIELD macros in xive-regs.h aren't used except for
a single instance of GETFIELD, so replace that and remove them.

These macros are also defined in vas.h, so either those should be
eventually replaced or the macros moved into bitops.h.

Signed-off-by: Russell Currey <[e-mail]>
[mpe: Rewrite the assignment to 'he' to avoid ffs() etc.]
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/include/asm/xive-regs.h

···
 #define TM_QW3_NSR_I		PPC_BIT8(2)
 #define TM_QW3_NSR_GRP_LVL	PPC_BIT8(3,7)
 
-/* Utilities to manipulate these (originaly from OPAL) */
-#define MASK_TO_LSH(m)		(__builtin_ffsl(m) - 1)
-#define GETFIELD(m, v)		(((v) & (m)) >> MASK_TO_LSH(m))
-#define SETFIELD(m, v, val)				\
-	(((v) & ~(m)) |	((((typeof(v))(val)) << MASK_TO_LSH(m)) & (m)))
-
 #endif /* _ASM_POWERPC_XIVE_REGS_H */

arch/powerpc/sysdev/xive/native.c

···
 	 * of the hypervisor interrupt (if any)
 	 */
 	cppr = ack & 0xff;
-	he = GETFIELD(TM_QW3_NSR_HE, (ack >> 8));
+	he = (ack >> 8) >> 6;
 	switch(he) {
 	case TM_QW3_NSR_HE_NONE: /* Nothing to see here */
 		break;