MIPS: math-emu: dsemul: Reduce `get_isa16_mode' clutter

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12178/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index bca7c43..46b964d 100644 (file)
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -38,6 +38,7 @@ struct emuframe {
  */
 int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 {
+       int isa16 = get_isa16_mode(regs->cp0_epc);
        mips_instruction break_math;
        struct emuframe __user *fr;
        int err;
@@ -47,7 +48,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
                return -1;
 
        /* microMIPS instructions */
-       if (get_isa16_mode(regs->cp0_epc)) {
+       if (isa16) {
                union mips_instruction insn = { .word = ir };
 
                /* NOP16 aka MOVE16 $0, $0 */
@@ -81,7 +82,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
         * multiprocessor support.  For Linux we use a BREAK 514
         * instruction causing a breakpoint exception.
         */
-       break_math = BREAK_MATH(get_isa16_mode(regs->cp0_epc));
+       break_math = BREAK_MATH(isa16);
 
        /* Ensure that the two instructions are in the same cache line */
        fr = (struct emuframe __user *)
@@ -91,7 +92,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
        if (unlikely(!access_ok(VERIFY_WRITE, fr, sizeof(struct emuframe))))
                return SIGBUS;
 
-       if (get_isa16_mode(regs->cp0_epc)) {
+       if (isa16) {
                err = __put_user(ir >> 16,
                                 (u16 __user *)(&fr->emul));
                err |= __put_user(ir & 0xffff,
@@ -113,8 +114,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
                return SIGBUS;
        }
 
-       regs->cp0_epc = ((unsigned long) &fr->emul) |
-               get_isa16_mode(regs->cp0_epc);
+       regs->cp0_epc = (unsigned long)&fr->emul | isa16;
 
        flush_cache_sigtramp((unsigned long)&fr->emul);
 
@@ -123,6 +123,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
 
 int do_dsemulret(struct pt_regs *xcp)
 {
+       int isa16 = get_isa16_mode(xcp->cp0_epc);
        struct emuframe __user *fr;
        unsigned long epc;
        u32 insn, cookie;
@@ -145,7 +146,7 @@ int do_dsemulret(struct pt_regs *xcp)
         *  - Is the instruction pointed to by the EPC an BREAK_MATH?
         *  - Is the following memory word the BD_COOKIE?
         */
-       if (get_isa16_mode(xcp->cp0_epc)) {
+       if (isa16) {
                err = __get_user(instr[0],
                                 (u16 __user *)(&fr->badinst));
                err |= __get_user(instr[1],
@@ -156,8 +157,8 @@ int do_dsemulret(struct pt_regs *xcp)
        }
        err |= __get_user(cookie, &fr->cookie);
 
-       if (unlikely(err || insn != BREAK_MATH(get_isa16_mode(xcp->cp0_epc)) ||
-                    cookie != BD_COOKIE)) {
+       if (unlikely(err ||
+                    insn != BREAK_MATH(isa16) || cookie != BD_COOKIE)) {
                MIPS_FPU_EMU_INC_STATS(errors);
                return 0;
        }