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 E3BDEC433EF for ; Mon, 24 Jan 2022 18:17:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7E9F16B00A3; Mon, 24 Jan 2022 13:17:18 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 799B26B00A4; Mon, 24 Jan 2022 13:17:18 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 68D7F6B00A6; Mon, 24 Jan 2022 13:17:18 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0132.hostedemail.com [216.40.44.132]) by kanga.kvack.org (Postfix) with ESMTP id 5A3416B00A3 for ; Mon, 24 Jan 2022 13:17:18 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 105798249980 for ; Mon, 24 Jan 2022 18:17:18 +0000 (UTC) X-FDA: 79065987756.17.7146A59 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) by imf06.hostedemail.com (Postfix) with ESMTP id 793D7180011 for ; Mon, 24 Jan 2022 18:17:17 +0000 (UTC) Received: by mail-pl1-f172.google.com with SMTP id y17so6102600plg.7 for ; Mon, 24 Jan 2022 10:17:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version; bh=08wQ/FjWhd9KqUOc/eygK6tPJPPOkuZJXthR/BJ1yOQ=; b=Yk1yEoQ8dSUuH70Owq9SrFlZ8iEBBJ2JlN/Agb3VcDyAS+Hw0PLCUcGTQpbYUlVRhd NDKuZ1ulFRT9MptnA02ChWFhtT3rDQeKp9ERrEkZA3dqUKvfJSFoncnYERrpOnuTgf1+ CmTQyGTU7sKiyA6We0JdSy9IsOlfSvw24gZc4/voFoOToWu8UlkXa5nAgAMRBkjm0nZt bM9uFooFDB43qdI8zab1kZd+yowvFtUOdXgai0A3iv6f/SansSGZiT3+PSutCLaR1Ivw Uian5SN/N/hKzlE79Imv3L9dK64i023UabCW0eSZQjZj9PfocX/l4B8yL47XW04ond61 oRQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:in-reply-to:message-id :references:mime-version; bh=08wQ/FjWhd9KqUOc/eygK6tPJPPOkuZJXthR/BJ1yOQ=; b=3d/VvB1EEtOLtQ6Xa/0Hl/wGgkM4osktjnZdHLh7xK2A9gHiGRvNJV5CEMISoHrIcj +Fro9e00kL1KYmU72jv4KE6dneeJlDevRQvocKW6bFfVN9qLoz9R8MXEbBwuP+Y7D8nu cFz6JeN7DJaUNeNThR4iQew6+U9hE8RXLxnnpaOH/ckjn42Dno+S2K3Ndxbg5mZ8JSgA QszF+ndVUFjwahCP/MCmeADM8o6LYH8NME9oAbrGF2mlBoep4YA30cTyKQQ3wFJsZO2I Z/rHM6tgM1821xInGM3t1MfxqP5++u0r5iCvQk7Gqu7aWyl1rtnXo/fTdwcyoscoo16R 14rA== X-Gm-Message-State: AOAM531DKGjGNBMLEd3fs3tFCQekO/g9qiU6YDUUMnx0TrddB7pwplsY KpUQe7o8qZCj5h2ZnGiruU9k/Q== X-Google-Smtp-Source: ABdhPJysob7/6AunTAmMMu9QWaHblyvtcySsEX5H+3uOnvKftwpkJWbsnDersNxYbqJTvSoUnQ5vmA== X-Received: by 2002:a17:902:7c09:b0:148:e02f:176b with SMTP id x9-20020a1709027c0900b00148e02f176bmr15367461pll.130.1643048235855; Mon, 24 Jan 2022 10:17:15 -0800 (PST) Received: from [2620:15c:29:204:1f99:bd65:fcbb:146c] ([2620:15c:29:204:1f99:bd65:fcbb:146c]) by smtp.gmail.com with ESMTPSA id ce15sm55886pjb.5.2022.01.24.10.17.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jan 2022 10:17:15 -0800 (PST) Date: Mon, 24 Jan 2022 10:17:14 -0800 (PST) From: David Rientjes To: Ard Biesheuvel cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: make 'highmem' symbol ro_after_init In-Reply-To: <20220124170555.1054480-1-ardb@kernel.org> Message-ID: <346af9f-d9ea-463a-686e-1cce79a1c8d2@google.com> References: <20220124170555.1054480-1-ardb@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 793D7180011 X-Stat-Signature: i9or9ywqe1tgkdajkgc4rd75n1zy69c1 Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=Yk1yEoQ8; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf06.hostedemail.com: domain of rientjes@google.com designates 209.85.214.172 as permitted sender) smtp.mailfrom=rientjes@google.com X-HE-Tag: 1643048237-313056 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 Mon, 24 Jan 2022, Ard Biesheuvel wrote: > diff --git a/mm/memory.c b/mm/memory.c > index c125c4969913..50e82cb94ccc 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -106,7 +106,7 @@ EXPORT_SYMBOL(mem_map); > * highstart_pfn must be the same; there must be no gap between ZONE_NORMAL > * and ZONE_HIGHMEM. > */ > -void *high_memory; > +void *high_memory __ro_after_init; > EXPORT_SYMBOL(high_memory); > > /* Same should be true for the mm/nommu.c variant?