From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73AAFC433F5 for ; Wed, 24 Nov 2021 03:25:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CC0F26B0075; Tue, 23 Nov 2021 22:24:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C6EE16B0078; Tue, 23 Nov 2021 22:24:56 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B5F106B007B; Tue, 23 Nov 2021 22:24:56 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0181.hostedemail.com [216.40.44.181]) by kanga.kvack.org (Postfix) with ESMTP id A87B06B0075 for ; Tue, 23 Nov 2021 22:24:56 -0500 (EST) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 64E0C876FA for ; Wed, 24 Nov 2021 03:24:46 +0000 (UTC) X-FDA: 78842381814.10.6E71995 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf24.hostedemail.com (Postfix) with ESMTP id 81972B0000B8 for ; Wed, 24 Nov 2021 03:24:42 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id A3FE9603E5; Wed, 24 Nov 2021 03:24:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1637724284; bh=W+p0I/Vdu6ckE5WZr75pCA5D+jb0/KHqAP51+aXEKW4=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=SdVHw92mY5N4vUemQ3poMNc4YdtBfEDmOpkJdE8f/T/yJO3lb+opcKuiQWQMrscjl 91iu7QXd/JNdNzRFNBlYnSpJ2Eh0BQ36xcCHQquWdAOlNkpWUTrBwduBaeS/kEZgH6 xXYFpJmNSzHZr/z8DhGv8MQfzEYacmWyAf//b9yo= Date: Tue, 23 Nov 2021 19:24:42 -0800 From: Andrew Morton To: "Matthew Wilcox (Oracle)" Cc: Yang Shi , Naoya Horiguchi , "Kirill A . Shutemov" , linux-mm@kvack.org, Hugh Dickins Subject: Re: [PATCH] filemap: Remove PageHWPoison check from next_uptodate_page() Message-Id: <20211123192442.f4e74b35a900463c5bc8a675@linux-foundation.org> In-Reply-To: <20211120174429.2596303-1-willy@infradead.org> References: <20211120174429.2596303-1-willy@infradead.org> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 81972B0000B8 Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=SdVHw92m; dmarc=none; spf=pass (imf24.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Stat-Signature: m4pxxxfcso1uw7cfsyyud58aut5yasw3 X-HE-Tag: 1637724282-885349 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: On Sat, 20 Nov 2021 17:44:29 +0000 "Matthew Wilcox (Oracle)" wrote: > Pages are individually marked as suffering from hardware poisoning. > Checking that the head page is not hardware poisoned doesn't make > sense; we might be after a subpage. We check each page individually > before we use it, so this was an optimisation gone wrong. What were the runtime effects of this bug?