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 X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 84757ECDFB4 for ; Tue, 17 Jul 2018 09:56:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A02920C0E for ; Tue, 17 Jul 2018 09:56:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="s8+GUvl1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3A02920C0E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731180AbeGQK2W (ORCPT ); Tue, 17 Jul 2018 06:28:22 -0400 Received: from mail-pl0-f67.google.com ([209.85.160.67]:39355 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731090AbeGQK2W (ORCPT ); Tue, 17 Jul 2018 06:28:22 -0400 Received: by mail-pl0-f67.google.com with SMTP id p23-v6so244714plo.6 for ; Tue, 17 Jul 2018 02:56:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=o8o4sZVJQSBGDEta+NME7mQcHJS9snLouehPKnWTVcE=; b=s8+GUvl1Glm4MwjuCLw5M4sf1hdjJilbFC1B32p3oXsWv4ZQvRjczYVLNxdUA8wa/r o2UXqiruneJSNHymgcKaLfyFGGoE4wVsb9ay5Zz00coghzkQSjLFKiEs4RR04gNfBhOF VE3djNS/5f8ETDzAqfyuGaJz+ljmwY65QURn0LgoCvOcwiTeeRsNR+EWWrXyRi0CGd+h s7WIsrOt9KNeYWMwL3aCUKbgvxVbWJuU4jOFxrWfJl8QlWe14g7qj025F9KKZ96ePqz4 YFLrUpI9He87HlOPTG8WVjJmg1xnxRHcEIzP3b5L63T8ebK1GApfk8azh9lLHjLKZ96j RrSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=o8o4sZVJQSBGDEta+NME7mQcHJS9snLouehPKnWTVcE=; b=Lp6ipJ2zJmtTT6kyhbBj7+4lCelrjHho9YKA3NdgzCJuzBsm/UkPovwOwj+ufEUl4z nPWFaKI2E++1W/3u7dJSHin96Yd3WdE5qW7ZlcJFFGZ+rwAH/Mcu7oFPFb1LxWeEiGXM 2/soZEaalA1Z4bt+cV0Oj8KISssU3kJFwImpAXa66gd8nxdiJoiOmqkiZa5W06diJaJO VFqNlOcarU+jbEeiFvtXD0cpKZYYbTDoA+NUUR2Ob9k0hPxDAOuYX1nyX+Axrz37ZJDI 2Hmc6oCf8vgLxXuns0X5ZoJ0t0iDQqaXRs9AywbSFOWLEZDsFJyCUlHiTfgCfxlGhRgi D0sA== X-Gm-Message-State: AOUpUlEsA98ugTp7lC8GnfaPgUlN+VgV2UlL6pwm9wh+CQkYprPrszl/ E0Zeae2hicdmzQUDP62KaNeYtg== X-Google-Smtp-Source: AAOMgpdF6RVKzXJyaLJUEYyBo1s5H6/kbvECkF7X8WQhxLq2AOr13yJPjx12Eit642tnRN7RH7JT8Q== X-Received: by 2002:a17:902:e3:: with SMTP id a90-v6mr962715pla.227.1531821393756; Tue, 17 Jul 2018 02:56:33 -0700 (PDT) Received: from toy.corp.qihoo.net ([104.192.108.9]) by smtp.gmail.com with ESMTPSA id u2-v6sm1232542pfn.59.2018.07.17.02.56.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Jul 2018 02:56:33 -0700 (PDT) From: Jun Yao To: linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will.deacon@arm.com, james.morse@arm.com, linux-kernel@vger.kernel.org Subject: [PATCH v4 4/6] arm64/mm: Make swapper_pg_dir smaller Date: Tue, 17 Jul 2018 17:56:06 +0800 Message-Id: <20180717095608.11008-5-yaojun8558363@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180717095608.11008-1-yaojun8558363@gmail.com> References: <20180717095608.11008-1-yaojun8558363@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We setup final page tables in swapper_pg_dir, which just contains PGD. And the PUD/PMD are allocated dynamically. So we can make it smaller. Signed-off-by: Jun Yao --- arch/arm64/kernel/vmlinux.lds.S | 2 +- arch/arm64/mm/mmu.c | 8 -------- 2 files changed, 1 insertion(+), 9 deletions(-) diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 61d7cee3eaa6..2446911f4262 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -237,7 +237,7 @@ SECTIONS . += RESERVED_TTBR0_SIZE; #endif swapper_pg_dir = .; - . += SWAPPER_DIR_SIZE; + . += PAGE_SIZE; swapper_pg_end = .; __pecoff_data_size = ABSOLUTE(. - __initdata_begin); diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index cdce3ec4c7bb..d24be05ec1d4 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -633,14 +633,6 @@ void __init paging_init(void) map_mem(swapper_pg_dir); cpu_replace_ttbr1(swapper_pg_dir); init_mm.pgd = swapper_pg_dir; - - /* - * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd - * allocated with it. - */ - memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE, - __pa_symbol(swapper_pg_end) - __pa_symbol(swapper_pg_dir) - - PAGE_SIZE); } /* -- 2.17.1