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Received: from 30.246.179.14(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0X3jezDI_1779882292 cluster:ay36) by smtp.aliyun-inc.com; Wed, 27 May 2026 19:44:53 +0800 Message-ID: <8ebf43de-16c1-4798-8d48-c93390ab6df0@linux.alibaba.com> Date: Wed, 27 May 2026 19:44:47 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 4/8] mm/hwpoison: return -EFAULT when copy fail in copy_mc_[user]_highpage() To: Ruidong Tian , catalin.marinas@arm.com, will@kernel.org, rafael@kernel.org, tony.luck@intel.com, guohanjun@huawei.com, mchehab@kernel.org, tongtiangen@huawei.com, james.morse@arm.com, robin.murphy@arm.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, mpe@ellerman.id.au, npiggin@gmail.com, ryabinin.a.a@gmail.com, glider@google.com, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, naveen.n.rao@linux.ibm.com, tglx@linutronix.de, mingo@redhat.com Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, Jonathan Cameron , Mauro Carvalho Chehab References: <20260518084956.2538442-1-tianruidong@linux.alibaba.com> <20260518084956.2538442-5-tianruidong@linux.alibaba.com> From: Shuai Xue In-Reply-To: <20260518084956.2538442-5-tianruidong@linux.alibaba.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260527_044458_815612_38E47BD7 X-CRM114-Status: GOOD ( 10.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 5/18/26 4:49 PM, Ruidong Tian wrote: > From: Tong Tiangen > > Currently, copy_mc_[user]_highpage() returns zero on success, or in case > of failures, the number of bytes that weren't copied. > > While tracking the number of not copied works fine for x86 and PPC, There > are some difficulties in doing the same thing on ARM64 because there is no > available caller-saved register in copy_page()(lib/copy_page.S) to save > "bytes not copied", and the following copy_mc_page() will also encounter > the same problem. > > Consider the caller of copy_mc_[user]_highpage() cannot do any processing > on the remaining data(The page has hardware errors), they only check if > copy was succeeded or not, make the interface more generic by using an > error code when copy fails (-EFAULT) or return zero on success. > > Signed-off-by: Tong Tiangen > Reviewed-by: Jonathan Cameron > Reviewed-by: Mauro Carvalho Chehab Reviewed-by: Shuai Xue Thanks. Shuai