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    Subject[PATCH 3.10 147/250] MIPS: Handle microMIPS jumps in the same way as MIPS32/MIPS64 jumps
    Date
    From: Paul Burton <paul.burton@imgtec.com>

    commit 096a0de427ea333f56f0ee00328cff2a2731bcf1 upstream.

    is_jump_ins() checks for plain jump ("j") instructions since commit
    e7438c4b893e ("MIPS: Fix sibling call handling in get_frame_info") but
    that commit didn't make the same change to the microMIPS code, leaving
    it inconsistent with the MIPS32/MIPS64 code. Handle the microMIPS
    encoding of the jump instruction too such that it behaves consistently.

    Signed-off-by: Paul Burton <paul.burton@imgtec.com>
    Fixes: e7438c4b893e ("MIPS: Fix sibling call handling in get_frame_info")
    Cc: Tony Wu <tung7970@gmail.com>
    Cc: linux-mips@linux-mips.org
    Patchwork: https://patchwork.linux-mips.org/patch/14533/
    Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
    Signed-off-by: Willy Tarreau <w@1wt.eu>
    ---
    arch/mips/kernel/process.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
    index 5a93369..3cfa3bc 100644
    --- a/arch/mips/kernel/process.c
    +++ b/arch/mips/kernel/process.c
    @@ -312,6 +312,8 @@ static inline int is_jump_ins(union mips_instruction *ip)
    return 0;
    }

    + if (ip->j_format.opcode == mm_j32_op)
    + return 1;
    if (ip->j_format.opcode == mm_jal32_op)
    return 1;
    if (ip->r_format.opcode != mm_pool32a_op ||
    --
    2.8.0.rc2.1.gbe9624a
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