linux-kernel - [PATCH 5.2 015/135] xtensa: add missing isync to the cpu

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Message-Id: <20190822170811.13303-16-sashal@kernel.org>
Date:   Thu, 22 Aug 2019 13:06:11 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Max Filippov <jcmvbkbc@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 5.2 015/135] xtensa: add missing isync to the cpu_reset TLB code

From: Max Filippov <jcmvbkbc@...il.com>

commit cd8869f4cb257f22b89495ca40f5281e58ba359c upstream.

ITLB entry modifications must be followed by the isync instruction
before the new entries are possibly used. cpu_reset lacks one isync
between ITLB way 6 initialization and jump to the identity mapping.
Add missing isync to xtensa cpu_reset.

Cc: stable@...r.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/xtensa/kernel/setup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 176cb46bcf12c..0634bfb82a0bc 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -515,6 +515,7 @@ void cpu_reset(void)
 				      "add	%2, %2, %7\n\t"
 				      "addi	%0, %0, -1\n\t"
 				      "bnez	%0, 1b\n\t"
+				      "isync\n\t"
 				      /* Jump to identity mapping */
 				      "jx	%3\n"
 				      "2:\n\t"
-- 
2.20.1