linux-kernel - [PATCH] MIPS: Clear XContext at boot time

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Message-Id: <20200422144535.1253459-1-jiaxun.yang@flygoat.com>
Date:   Wed, 22 Apr 2020 22:45:34 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org
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@...goat.com>
---
 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
-- 
2.26.0.rc2