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Fri, 26 Feb 2021 10:22:32 +0800 (HKT) Received: from alex-virtual-machine (172.16.253.254) by KSBJMAIL2.kingsoft.cn (10.88.1.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Fri, 26 Feb 2021 10:52:51 +0800 Date: Fri, 26 Feb 2021 10:52:50 +0800 From: Aili Yao To: Oscar Salvador CC: "HORIGUCHI =?UTF-8?B?TkFPWUE=?=(=?UTF-8?B?5aCA5Y+j44CA55u05Lmf?=)" , "tony.luck@intel.com" , "david@redhat.com" , "akpm@linux-foundation.org" , "bp@alien8.de" , "tglx@linutronix.de" , "mingo@redhat.com" , "hpa@zytor.com" , "x86@kernel.org" , "linux-edac@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "yangfeng1@kingsoft.com" Subject: Re: [PATCH] mm,hwpoison: return -EBUSY when page already poisoned Message-ID: <20210226105250.3a15e35c@alex-virtual-machine> In-Reply-To: <20210225113930.GA7227@localhost.localdomain> References: <20210224151619.67c29731@alex-virtual-machine> <20210224103105.GA16368@linux> <20210225114329.4e1a41c6@alex-virtual-machine> <20210225112818.GA10141@hori.linux.bs1.fc.nec.co.jp> <20210225113930.GA7227@localhost.localdomain> Organization: kingsoft X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.30; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [172.16.253.254] X-ClientProxiedBy: KSBJMAIL1.kingsoft.cn (10.88.1.31) To KSBJMAIL2.kingsoft.cn (10.88.1.32) X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsXCFcGooJsRbZFg8LOB3WLO+jVsFp83/GOz +Lr+F7PFtI3iFrcPrGG0uLxrDpvFvTX/WS0uHVjAZHGx8QCjxZlpRRabN01ltnhz4R6LxY8N j1kdeD2+t/axeCze85LJY9OqTjaPTZ8msXu8O3eO3ePEjN8sHi+ubmTxeL/vKpvH5tPVHp83 yXmcaPnCGsAdxWWTkpqTWZZapG+XwJVx4OVS1oJHLBUnjjUwNTDeYu5i5OSQEDCROLLsAmMX IxeHkMB0JomTb44wQTivGCX6mw6ygVSxCKhK9O/bwQRiswHZu+7NYgWxRQTUJKa9amQHaWAW 6GaVOLtxPTtIQljAS+LL/bWMIDavgJXE/OYmFhCbE8hetX46K8SGz4wSMxf0gW3gFxCT6L3y nwniJnuJti2LoJoFJU7OfALWzCygI3Fi1TFmCFteYvvbOWC2kICixOElv9ghepUkjnTPYIOw YyWWzXvFOoFReBaSUbOQjJqFZNQCRuZVjCzFuelGmxghMRi6g3FG00e9Q4xMHIyHGCU4mJVE eDf/M00Q4k1JrKxKLcqPLyrNSS0+xCjNwaIkzjt1q0mCkEB6YklqdmpqQWoRTJaJg1OqgSnt sMaDi3tubduy4f8LxWq2F2/2LZ2yISE6PyXxzRfzziUC9a8stfjOGu9t2s7k/+Hl4rlib7xP fFlSK98QJO/kF7Q1/MLq/gjBfbExP+RNynqaspc1HpAp40mx87pl3ms6a/cfT+57Pj76GgJL w4uL05y8vuZUX3ykzFeRNkH2lGz933c/zPweuU50rGDnWzpZcu3OptbuPIHpT3hftxtp/sri Ws51Pcdk7blFH0qv/XfWdhV26PaX4nzuM2/tv7+7OGr+WL656rN8dunCCZ89flw2ky97U/3Y XeNyaRvXd8GL8gzmK085ye/Sty6rzfR3cuq6pbtzgcuTe7vUttUt3GHpsq79WnnwgpBJQUos xRmJhlrMRcWJADSJYpIwAwAA X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D7D61200038D X-Stat-Signature: pzanuk1ijb3683udkd6rc7mdy8yrftzj Received-SPF: none (kingsoft.com>: No applicable sender policy available) receiver=imf18; identity=mailfrom; envelope-from=""; helo=mail.kingsoft.com; client-ip=114.255.44.145 X-HE-DKIM-Result: none/none X-HE-Tag: 1614307977-178593 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000918, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi naoya,Oscar,david: > > > We could use some negative value (error code) to report the reported case, > > then as you mentioned above, some callers need change to handle the > > new case, and the same is true if you use some positive value. > > My preference is -EHWPOISON, but other options are fine if justified well. > > -EHWPOISON seems like a good fit. > I am OK with the -EHWPOISON error code, But I have one doubt here: When we return this -EHWPOISON error code, Does this means we have to add a new error code to error-base.h or errno.h? Is this easy realized? Thanks! Aili Yao