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Peter Anvin" CC: , , , , Kefeng Wang , Xie XiuQi , Guohanjun , Tong Tiangen Subject: [PATCH -next v6 09/10] arm64: add uaccess to machine check safe Date: Tue, 21 Jun 2022 07:26:37 +0000 Message-ID: <20220621072638.1273594-10-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220621072638.1273594-1-tongtiangen@huawei.com> References: <20220621072638.1273594-1-tongtiangen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655796455; a=rsa-sha256; cv=none; b=G9DNWG8lmGZILs3JfRjN+GDKl2GOsq3Yu3pwrCBqY3LHYbq8MXRZb7zlLE39AgRaXJvn87 5fM41yu9cVGtQABO43XpRWrql2SXawlSUjrGpAKOT+pN3RGXUhHwd8ljAQ1uUg/F9ZlQmW 12DU0KOsY8JiJaqDKn6aSZiiZD0wU9k= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf13.hostedemail.com: domain of tongtiangen@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=tongtiangen@huawei.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655796455; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jQKhpRFZYNSMJJ68eyFcWrh5PEMv/jS/d7zTq+MXzzs=; b=wWCMyIk9Mp8beWaIA8R24YHdsTpnf1e6r/11Fw3qPnMtMjaW/vUHuAz/xj1s2L0nXDoiUx dErxUfwjtP4ivSqCnUyDqoUA2Rkrmvengl99Iu4DLWxSd+OnUghBabtAOjcxK+gSsthdoP h50B0cPLTKXKlnvQlGzf+hklmZaBQYA= Authentication-Results: imf13.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf13.hostedemail.com: domain of tongtiangen@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=tongtiangen@huawei.com X-Stat-Signature: j81s1ae89ms3wjdp9um9d8k53k5ut1nb X-Rspamd-Queue-Id: 54B55200B6 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1655796455-485240 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 --- 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; }