Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp4273964pxu; Wed, 9 Dec 2020 12:45:27 -0800 (PST) X-Google-Smtp-Source: ABdhPJwMFBqajrTK+V/DAKJJIF7o6Tv9br0WXCrNnshRnw+IOlqFfQQS8dUU7EN0ywGUcvXb7pdU X-Received: by 2002:a50:e0c9:: with SMTP id j9mr3699467edl.380.1607546727155; Wed, 09 Dec 2020 12:45:27 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1607546727; cv=none; d=google.com; s=arc-20160816; b=KIGwF1uRH61b6I68sysFtEiZk4jdK2/U7NCBKc+rgD2/wFYNy6dTf703F74mORw/RM UAyUf5wY0/55latgvZ59hB+W8YYk58OfUTYcbPJmdHtOgwJ2ufwRTzPlbGT2FQtTtOif 18sC7xM0C2cQ0BWE44VDZFotGffht0fJ+Ud+jRHtbUAcxxVHFx9xNzFst61oLvPsXx8o UK1wWMoehH0rqy5u6c3rTWB0uARbGf/pPc9ToN3WW+vd0P5Z8T0cFLtMPK5QkvgZELvf WFGBBXljmu4LxvuuoAEcfvoe2W51Jr06kMTy6Vsz0FlZACxi7PIyPeznwjrCKbfKr78t DVYQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:subject:message-id:date:from:in-reply-to :references:mime-version:dkim-signature; bh=eXNuciZGAoMUd/SECQlzOKmimQYdL/sit6tT9G5FsLo=; b=JtBdWNxLAbL9/Qfs7tQwN1A73baLwiC9JT7Un076pihzx+64nOUD6A3qjJUMszKagv wqBAUxkaq4GLPwh6GoAobFklCRIgAInKUMBza9ep1C/klt0OJ9rmZelBHfM1HDbLF8Mx NZ3sg98EO44S02lYwBmm9pouwioBfMAoBVrl69iU06mRJiPYBpKoI6nTKE9QWLfr7R4W /C9sTfr4fxtivkLLwZy7PZT6ECHX97lwFZvjD1ZfNxED70h2K1VbNHLIrjdO873qwArx Rxzde8rSJ4dWXdxKqzNpBbtXA3OOli58UMqcRHP6j/WxKoN5T5bgk83hOB6o0Dq1oioK 24Fw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel-com.20150623.gappssmtp.com header.s=20150623 header.b=Q4GredAd; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id g25si1332920ejp.67.2020.12.09.12.45.03; Wed, 09 Dec 2020 12:45:27 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@intel-com.20150623.gappssmtp.com header.s=20150623 header.b=Q4GredAd; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732549AbgLIUUn (ORCPT + 99 others); Wed, 9 Dec 2020 15:20:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728107AbgLIUUm (ORCPT ); Wed, 9 Dec 2020 15:20:42 -0500 Received: from mail-ej1-x642.google.com (mail-ej1-x642.google.com [IPv6:2a00:1450:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 317B7C0613D6 for ; Wed, 9 Dec 2020 12:20:02 -0800 (PST) Received: by mail-ej1-x642.google.com with SMTP id x16so4011935ejj.7 for ; Wed, 09 Dec 2020 12:20:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=eXNuciZGAoMUd/SECQlzOKmimQYdL/sit6tT9G5FsLo=; b=Q4GredAdgUUiXIbnr4HhP9p4y/6aHiGOTj9T+SVRf3kx4jQtzCfwRvKnAkHYEBZcWE ee3uqdHPp5k4JKb79Y5S6kmR/D4Q8upV/TIaPHuo+cxp4w8Oydj91Gxcl5tUuo7jtpaC KXfE7t6+r2NUrtdhqQE0bu2sWsOhFqtqL0B2CfN8vZnUCOMLZS2YQZ+qAs/dXQ+eYEi7 +Py9L7vzjcQn5Av1sENWe5rJZydVY3MRfw/QlMLb6QKyq5OhAFqelIG3UrmT6v7vIZId kjPTp3aik1B619eE8Q/U0xq5arI3NIWjhKvCG34pgak0WPwVbCwyzsi5BZbPZl63GqaI DFxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=eXNuciZGAoMUd/SECQlzOKmimQYdL/sit6tT9G5FsLo=; b=Eo+zYFdN+WVaPeKO0qiTBF2zOOAr5RpQhAr16vK2PysvJJ/cYRjJ0s7Ba0Wry/W6D+ WlB5O/+JOv7OrWf12zW7J13ul2zK02GyVuMeO6WvFaYadfPnjTpV6lx4/+Jjoviyz48H DOzR0GIbyn+SFgjNdiE98rWzptIg1S2ETM3pZTHRTlrE8QR3aOYOI3cZ5KxlQY+jOaL3 HBZGAe1swCqbAY9/mKwRfQSos9S+ALnlLWqWYuCgfJshAfTQXuTC07vMEsLEdBwTXtga ttHJvaMgaheRhBxg6y91bFahn5P4J1B3OEHB37nqxf5QdfhWhBYneGZaZ/TuDRSpCeo7 3yAA== X-Gm-Message-State: AOAM531kws74xvvZ466EFbLGA+ykDkcz6DhLoncfvQfkz9FT5jQLoGsG Mb2qReLCF/TBJ1vCJuvJEDJzhH68KFbB37D0bym7uA== X-Received: by 2002:a17:907:c15:: with SMTP id ga21mr3603934ejc.472.1607545200188; Wed, 09 Dec 2020 12:20:00 -0800 (PST) MIME-Version: 1.0 References: <20201208213255.GO1563847@iweiny-DESK2.sc.intel.com> <20201208215028.GK7338@casper.infradead.org> <20201208223234.GL7338@casper.infradead.org> <20201208224555.GA605321@magnolia> <20201209022250.GP1563847@iweiny-DESK2.sc.intel.com> <20201209040312.GN7338@casper.infradead.org> <20201209201415.GT7338@casper.infradead.org> In-Reply-To: <20201209201415.GT7338@casper.infradead.org> From: Dan Williams Date: Wed, 9 Dec 2020 12:19:57 -0800 Message-ID: Subject: Re: [PATCH V2 2/2] mm/highmem: Lift memcpy_[to|from]_page to core To: Matthew Wilcox Cc: Ira Weiny , "Darrick J. Wong" , Thomas Gleixner , Andrew Morton , Dave Hansen , Christoph Hellwig , Al Viro , Eric Biggers , Joonas Lahtinen , Linux Kernel Mailing List , linux-fsdevel Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 9, 2020 at 12:14 PM Matthew Wilcox wrote: [..] > If we put in into a separate patch, someone will suggest backing out the > patch which tells us that there's a problem. You know, like this guy ... > https://lore.kernel.org/linux-mm/CAPcyv4jNVroYmirzKw_=CsEixOEACdL3M1Wc4xjd_TFv3h+o8Q@mail.gmail.com/ ...and that person, like in this case, will be told 'no' and go on to find / fix the real problem.