From c213db614685e8dc9f910bca5cf934816ba423fe Mon Sep 17 00:00:00 2001
From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: Wed, 22 Apr 2020 22:45:34 +0800
Subject: [PATCH] MIPS: Clear XContext at boot time

XContext might be dirty at boot time. We need to clear it
to ensure early stackframe is safe.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 arch/mips/kernel/head.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 351d40fe0859..3b02ffe46304 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -132,6 +132,9 @@ dtb_found:
 #endif
 
 	MTC0		zero, CP0_CONTEXT	# clear context register
+#ifdef CONFIG_64BIT
+	MTC0		zero, CP0_XCONTEXT
+#endif
 	PTR_LA		$28, init_thread_union
 	/* Set the SP after an empty pt_regs.  */
 	PTR_LI		sp, _THREAD_SIZE - 32 - PT_SIZE