releases/5.0.15/mips-kgdb-fix-kgdb-support-for-smp-platforms.patch

   1 From aff39bcb7b93a2fc3db9dda7e641683b8a1ff33a Mon Sep 17 00:00:00 2001
   2 From: Chong Qiao <qiaochong@loongson.cn>
   3 Date: Thu, 28 Mar 2019 07:08:01 +0800
   4 Subject: MIPS: KGDB: fix kgdb support for SMP platforms.
   5
   6 [ Upstream commit ab8a6d821179ab9bea1a9179f535ccba6330c1ed ]
   7
   8 KGDB_call_nmi_hook is called by other cpu through smp call.
   9 MIPS smp call is processed in ipi irq handler and regs is saved in
  10  handle_int.
  11 So kgdb_call_nmi_hook get regs by get_irq_regs and regs will be passed
  12  to kgdb_cpu_enter.
  13
  14 Signed-off-by: Chong Qiao <qiaochong@loongson.cn>
  15 Reviewed-by: Douglas Anderson <dianders@chromium.org>
  16 Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
  17 Signed-off-by: Paul Burton <paul.burton@mips.com>
  18 Cc: Ralf Baechle <ralf@linux-mips.org>
  19 Cc: James Hogan <jhogan@kernel.org>
  20 Cc: Will Deacon <will.deacon@arm.com>
  21 Cc: Christophe Leroy <christophe.leroy@c-s.fr>
  22 Cc: linux-mips@vger.kernel.org
  23 Cc: linux-kernel@vger.kernel.org
  24 Cc: QiaoChong <qiaochong@loongson.cn>
  25 Signed-off-by: Sasha Levin <sashal@kernel.org>
  26 ---
  27  arch/mips/kernel/kgdb.c | 3 ++-
  28  1 file changed, 2 insertions(+), 1 deletion(-)
  29
  30 diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
  31 index 149100e1bc7c4..90f37626100fe 100644
  32 --- a/arch/mips/kernel/kgdb.c
  33 +++ b/arch/mips/kernel/kgdb.c
  34 @@ -33,6 +33,7 @@
  35  #include <asm/processor.h>
  36  #include <asm/sigcontext.h>
  37  #include <linux/uaccess.h>
  38 +#include <asm/irq_regs.h>
  39
  40  static struct hard_trap_info {
  41         unsigned char tt;       /* Trap type code for MIPS R3xxx and R4xxx */
  42 @@ -214,7 +215,7 @@ void kgdb_call_nmi_hook(void *ignored)
  43         old_fs = get_fs();
  44         set_fs(get_ds());
  45
  46 -       kgdb_nmicallback(raw_smp_processor_id(), NULL);
  47 +       kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
  48
  49         set_fs(old_fs);
  50  }
  51 --
  52 2.20.1
  53