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From: Shuai Xue <xueshuai@linux•alibaba.com>
To: Ruidong Tian <tianruidong@linux•alibaba.com>,
	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 <Jonathan.Cameron@huawei•com>,
	Mauro Carvalho Chehab <mchehab+huawei@kernel•org>
Subject: Re: [PATCH v14 4/8] mm/hwpoison: return -EFAULT when copy fail in copy_mc_[user]_highpage()
Date: Wed, 27 May 2026 19:44:47 +0800	[thread overview]
Message-ID: <8ebf43de-16c1-4798-8d48-c93390ab6df0@linux.alibaba.com> (raw)
In-Reply-To: <20260518084956.2538442-5-tianruidong@linux.alibaba.com>



On 5/18/26 4:49 PM, Ruidong Tian wrote:
> From: Tong Tiangen <tongtiangen@huawei•com>
> 
> 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 <tongtiangen@huawei•com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei•com>
> Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel•org>

Reviewed-by: Shuai Xue <xueshuai@linux•alibaba.com>
Thanks.
Shuai


  reply	other threads:[~2026-05-27 11:45 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-18  8:49 [PATCH v14 0/8] arm64: add ARCH_HAS_COPY_MC support Ruidong Tian
2026-05-18  8:49 ` [PATCH v14 1/8] uaccess: add generic fallback version of copy_mc_to_user() Ruidong Tian
2026-05-27  9:16   ` Shuai Xue
2026-05-18  8:49 ` [PATCH v14 2/8] ACPI: APEI: GHES: use exception context to gate SIGBUS on poison consumption Ruidong Tian
2026-05-27  9:34   ` Shuai Xue
2026-05-18  8:49 ` [PATCH v14 3/8] arm64: add support for ARCH_HAS_COPY_MC Ruidong Tian
2026-05-27 11:35   ` Shuai Xue
2026-06-04  8:10     ` Ruidong Tian
2026-05-18  8:49 ` [PATCH v14 4/8] mm/hwpoison: return -EFAULT when copy fail in copy_mc_[user]_highpage() Ruidong Tian
2026-05-27 11:44   ` Shuai Xue [this message]
2026-05-18  8:49 ` [PATCH v14 5/8] arm64: support copy_mc_[user]_highpage() Ruidong Tian
2026-05-27 12:11   ` Shuai Xue
2026-05-18  8:49 ` [PATCH v14 6/8] lib/test: memcpy_kunit: add copy_page() and copy_mc_page() tests Ruidong Tian
2026-05-27 13:43   ` Shuai Xue
2026-05-18  8:49 ` [PATCH v14 7/8] arm64: introduce copy_mc_to_kernel() implementation Ruidong Tian
2026-05-28  3:10   ` Shuai Xue
2026-05-18  8:49 ` [PATCH v14 8/8] lib/tests: memcpy_kunit: add memcpy_mc() and memcpy_mc_large() test Ruidong Tian
2026-05-28  3:17   ` Shuai Xue
2026-05-18 15:05 ` [PATCH v14 0/8] arm64: add ARCH_HAS_COPY_MC support Kefeng Wang
2026-06-05  7:33   ` Ruidong Tian

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