MIPS: math-emu: Avoid definition duplication for macro DPXMULT()

Avoid duplicate definition of macro DPXMULT(). Move its definition
to a header.
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@mips.com>
Cc: Douglas Leung <douglas.leung@mips.com>
Cc: Goran Ferenc <goran.ferenc@mips.com>
Cc: James Hogan <james.hogan@mips.com>
Cc: Miodrag Dinic <miodrag.dinic@mips.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Petar Jovanovic <petar.jovanovic@mips.com>
Cc: Raghu Gandham <raghu.gandham@mips.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17584/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/math-emu/dp_maddf.c

@@ -201,9 +201,6 @@ static union ieee754dp _dp_maddf(union ieee754dp z, union ieee754dp x,
 	 * Multiply 64 bits xm and ym to give 128 bits result in hrm:lrm.
 	 */
 
-	/* 32 * 32 => 64 */
-#define DPXMULT(x, y)	((u64)(x) * (u64)y)
-
 	lxm = xm;
 	hxm = xm >> 32;
 	lym = ym;

arch/mips/math-emu/dp_mul.c

@@ -128,9 +128,6 @@ union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y)
 	 * Multiply 64 bits xm, ym to give high 64 bits rm with stickness.
 	 */
 
-	/* 32 * 32 => 64 */
-#define DPXMULT(x, y)	((u64)(x) * (u64)y)
-
 	lxm = xm;
 	hxm = xm >> 32;
 	lym = ym;

arch/mips/math-emu/ieee754dp.h

@@ -55,6 +55,9 @@ static inline int ieee754dp_finite(union ieee754dp x)
 #define XDPSRS1(v)	\
 	(((v) >> 1) | ((v) & 1))
 
+/* 32bit * 32bit => 64bit unsigned integer multiplication */
+#define DPXMULT(x, y)	((u64)(x) * (u64)y)
+
 /* convert denormal to normalized with extended exponent */
 #define DPDNORMx(m,e) \
 	while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }