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From:   Tong Tiangen <tongtiangen@huawei.com>
To:     Mark Rutland <mark.rutland@arm.com>,
        James Morse <james.morse@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
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        Dave Hansen <dave.hansen@linux.intel.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
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        "H . Peter Anvin" <hpa@zytor.com>
CC:     <linuxppc-dev@lists.ozlabs.org>,
        <linux-arm-kernel@lists.infradead.org>,
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        Kefeng Wang <wangkefeng.wang@huawei.com>,
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        Guohanjun <guohanjun@huawei.com>,
        Tong Tiangen <tongtiangen@huawei.com>
Subject: [PATCH -next v7 3/4] arm64: add uaccess to machine check safe
Date:   Fri, 12 Aug 2022 07:05:56 +0000
Message-ID: <20220812070557.1028499-4-tongtiangen@huawei.com>
In-Reply-To: <20220812070557.1028499-1-tongtiangen@huawei.com>
References: <20220812070557.1028499-1-tongtiangen@huawei.com>
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If user access fail due to hardware memory error, only the relevant
processes are affected, so killing the user process and isolate the
error page with hardware memory errors is a more reasonable choice
than kernel panic.

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
---
 arch/arm64/mm/extable.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index 478e639f8680..28ec35e3d210 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -85,10 +85,10 @@ bool fixup_exception_mc(struct pt_regs *regs)
 	if (!ex)
 		return false;
 
-	/*
-	 * This is not complete, More Machine check safe extable type can
-	 * be processed here.
-	 */
+	switch (ex->type) {
+	case EX_TYPE_UACCESS_ERR_ZERO:
+		return ex_handler_uaccess_err_zero(ex, regs);
+	}
 
 	return false;
 }
-- 
2.25.1