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

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Date:   Thu,  9 May 2019 20:42:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chong Qiao <qiaochong@...ngson.cn>,
        Douglas Anderson <dianders@...omium.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        linux-mips@...r.kernel.org, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 26/66] MIPS: KGDB: fix kgdb support for SMP platforms.

[ 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@...ngson.cn>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: James Hogan <jhogan@...nel.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Christophe Leroy <christophe.leroy@....fr>
Cc: linux-mips@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: QiaoChong <qiaochong@...ngson.cn>
Signed-off-by: Sasha Levin <sashal@...nel.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 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