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    Subject[PATCH AUTOSEL 4.19 21/53] MIPS: KGDB: fix kgdb support for SMP platforms.
    Date
    From: Chong Qiao <qiaochong@loongson.cn>

    [ Upstream commit ab8a6d821179ab9bea1a9179f535ccba6330c1ed ]

    KGDB_call_nmi_hook is called by other cpu through smp call.
    MIPS smp call is processed in ipi irq handler and regs is saved in
    handle_int.
    So kgdb_call_nmi_hook get regs by get_irq_regs and regs will be passed
    to kgdb_cpu_enter.

    Signed-off-by: Chong Qiao <qiaochong@loongson.cn>
    Reviewed-by: Douglas Anderson <dianders@chromium.org>
    Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
    Signed-off-by: Paul Burton <paul.burton@mips.com>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: James Hogan <jhogan@kernel.org>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Christophe Leroy <christophe.leroy@c-s.fr>
    Cc: linux-mips@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Cc: QiaoChong <qiaochong@loongson.cn>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/mips/kernel/kgdb.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
    index eb6c0d582626..2c1e30ca7ee4 100644
    --- a/arch/mips/kernel/kgdb.c
    +++ b/arch/mips/kernel/kgdb.c
    @@ -33,6 +33,7 @@
    #include <asm/processor.h>
    #include <asm/sigcontext.h>
    #include <linux/uaccess.h>
    +#include <asm/irq_regs.h>

    static struct hard_trap_info {
    unsigned char tt; /* Trap type code for MIPS R3xxx and R4xxx */
    @@ -214,7 +215,7 @@ static void kgdb_call_nmi_hook(void *ignored)
    old_fs = get_fs();
    set_fs(get_ds());

    - kgdb_nmicallback(raw_smp_processor_id(), NULL);
    + kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());

    set_fs(old_fs);
    }
    --
    2.19.1
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