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 02C9AE95A8E for ; Mon, 9 Oct 2023 11:42:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346237AbjJILmn (ORCPT ); Mon, 9 Oct 2023 07:42:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41924 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232860AbjJILml (ORCPT ); Mon, 9 Oct 2023 07:42:41 -0400 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 196B699 for ; Mon, 9 Oct 2023 04:42:40 -0700 (PDT) Received: by mail-wr1-x434.google.com with SMTP id ffacd0b85a97d-3296b3f03e5so2582111f8f.2 for ; Mon, 09 Oct 2023 04:42:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696851758; x=1697456558; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=CvJorMuFBXShUBAbYuXfd7JQ2grUfnhQ9ROdTAA57lQ=; b=KEI7b1APbjIoGBGmscv9ht2SGC/WFaS5PpStI9SXsEabrTYKDUBeTWsUhEFMs/MJnN BnfIEt3bYeXy7f0YGX49CNcO8hEVSnT2hqXqKR/Wk3wA8PYrOWlf4JQD2fdkDq3KdRFd XH47+zRNGqZi6B5u6oJvfA3t0la2Jx74OuKKVWQDWFgmRKbP7aZA4TXbnPyjqK9rygU1 jqECAEp279PR8qOONhq11xkNA2kAsqP9OBE3QxvaT2uRmU0MgfW6KQE69l9gOHTBNaZp o4Oloaxt9t+swUiaBWDFcO3UbVDQZLxgto7FLmViM7VIXdiIfqI9u1yrVKP1dSdQtNeW 2vRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696851758; x=1697456558; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=CvJorMuFBXShUBAbYuXfd7JQ2grUfnhQ9ROdTAA57lQ=; b=t8XSyNrDPlOkBSsR+xXlGd9RejhEK3Z4pqh/ckVN2vvGSu+7olAz/sBSJusXY2EsOG vmYWiaQo6I3M0srE3iyp7luZXbK+HRgTUjK4MtoaFQaJ55ooej/tWYXWXR+xGUQNdFjK pQydea5donhpiftHVyxCvN22yKj7B3V+pnEMxf5pZxDWbrBQbsuSJly8VP4DK/Rbf+UZ kYb2lMujrGYu2LCWgVqAr8mnb2C2IaVLsfe5RUqfmLXWvdPryzJIQXF1q6MBSvkiTkL4 FQPW4etuHH/BlZhokWaQErKNQVXS8C7ScwnaUCMUUktzMKCUNzu79javeqiM4S8tV8R1 gEaQ== X-Gm-Message-State: AOJu0YxR0u2SdGqaR4vGbyETXcOs8Fq6g9wMbpGsZX/ov2ZZvAzoas7a nmEVl6/ZDlFVowwvP7zwmUs= X-Google-Smtp-Source: AGHT+IEC37Xha18STZ3mfexgQStjZoXsXpZAcA4ENZUNd1JUjTcurabED8P2/dUUQDcFpQsBtI5ZyQ== X-Received: by 2002:a5d:4ace:0:b0:327:d08a:1fa2 with SMTP id y14-20020a5d4ace000000b00327d08a1fa2mr12722639wrs.36.1696851758256; Mon, 09 Oct 2023 04:42:38 -0700 (PDT) Received: from gmail.com (1F2EF237.nat.pool.telekom.hu. [31.46.242.55]) by smtp.gmail.com with ESMTPSA id w21-20020a05600c015500b0040535648639sm10946866wmm.36.2023.10.09.04.42.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Oct 2023 04:42:37 -0700 (PDT) Sender: Ingo Molnar Date: Mon, 9 Oct 2023 13:42:35 +0200 From: Ingo Molnar To: Uros Bizjak Cc: Linus Torvalds , x86@kernel.org, linux-kernel@vger.kernel.org, Andy Lutomirski , Nadav Amit , Brian Gerst , Denys Vlasenko , "H . Peter Anvin" , Peter Zijlstra , Thomas Gleixner , Borislav Petkov , Josh Poimboeuf Subject: Re: [PATCH 4/4] x86/percpu: Use C for percpu read/write accessors Message-ID: References: <20231004145137.86537-1-ubizjak@gmail.com> <20231004145137.86537-5-ubizjak@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Uros Bizjak wrote: > I have tried the trick with all reads volatile (and writes as they were > before the patch), but it didn't make a difference. Also, the kernel from > the git/tip branch works OK for default config, so I think there is some > config option that somehow disturbs the named-as enabled kernel. Yeah, I made sure tip:x86/percpu boots & works fine on a number of systems - but that testing wasn't comprehensive at all, and I didn't have KASAN enabled either, which generates pretty intrusive instrumentation. Thanks, Ingo