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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22A29C433F5 for ; Tue, 29 Mar 2022 19:13:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240892AbiC2TPR (ORCPT ); Tue, 29 Mar 2022 15:15:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238969AbiC2TPO (ORCPT ); Tue, 29 Mar 2022 15:15:14 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D338B1EEDC; Tue, 29 Mar 2022 12:13:30 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 8631A21A2B; Tue, 29 Mar 2022 19:13:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1648581209; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Zzux7evVbtH+m7VA+DSlcqgknENtBIaS5EV1mQ6pGsA=; b=uQFfaFfHCFQbQq37zmyxuyq31d0Ap5jMuUdXvezuuG9OE/Zyhxrzb6XJQIbQin9a/bABys TXfwrvWNtB47YzOJWjEVccoIvq19a4EmQlwln5TRGBIJlBh61eFERcGZyX36qXclNmeKa3 cDI0Mp6fg/PucyIh5fXcc5tyVx9BKA8= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1648581209; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Zzux7evVbtH+m7VA+DSlcqgknENtBIaS5EV1mQ6pGsA=; b=rUivqUqMHgCFVcFiGO8lOlw4ogru8KE7msvD3CVxl1qQ5+6B29DwCaWhA7n16Hyu7AmFdJ 2MHlhHiJKWyaAjBg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id D17FF13A7E; Tue, 29 Mar 2022 19:13:28 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id NOfnL1haQ2LHVAAAMHmgww (envelope-from ); Tue, 29 Mar 2022 19:13:28 +0000 Date: Tue, 29 Mar 2022 21:13:27 +0200 From: Oscar Salvador To: Rik van Riel Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel-team@fb.com, Miaohe Lin , Naoya Horiguchi , Mel Gorman , Johannes Weiner , Andrew Morton , stable@vger.kernel.org Subject: Re: [PATCH] mm,hwpoison: unmap poisoned page before invalidation Message-ID: References: <20220325161428.5068d97e@imladris.surriel.com> <47936edb3b0f9c9f04f0d0d2e7f38383a22b6a3d.camel@surriel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47936edb3b0f9c9f04f0d0d2e7f38383a22b6a3d.camel@surriel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 29, 2022 at 11:49:53AM -0400, Rik van Riel wrote: > It results in us returning to userspace as if the page > fault had been handled, resulting in a second fault on > the same address. > > However, now the page is no longer in the page cache, > and we can read it in from disk, to a page that is not > hardware poisoned, and we can then use that second page > without issues. Ok, I see, thanks a lot for the explanation Rik. -- Oscar Salvador SUSE Labs