[PATCH 4.19 26/66] MIPS: KGDB: fix kgdb support for SMP platforms.

[Greg Kroah-Hartman]

[ 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@xxxxxxxxxxx>
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Acked-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Signed-off-by: Paul Burton <paul.burton@xxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: QiaoChong <qiaochong@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 eb6c0d582626b..2c1e30ca7ee4e 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);
 }
-- 
2.20.1