MIPS: Don't try to decode microMIPS branch instructions where they cannot exist.

In mm_isBranchInstr() we can short circuit the entire function if
!cpu_has_mmips.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5326/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index f037719..e773659 100644 (file)
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -471,6 +471,9 @@ int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
        unsigned int fcr31;
        unsigned int bit;
 
+       if (!cpu_has_mmips)
+               return 0;
+
        switch (insn.mm_i_format.opcode) {
        case mm_pool32a_op:
                if ((insn.mm_i_format.simmediate & MM_POOL32A_MINOR_MASK) ==