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 0A5CDECDFAA for ; Wed, 18 Jul 2018 10:18:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AE71C2084E for ; Wed, 18 Jul 2018 10:18:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZGq+kwnN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AE71C2084E 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 S1731139AbeGRKzR (ORCPT ); Wed, 18 Jul 2018 06:55:17 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:42216 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731035AbeGRKzQ (ORCPT ); Wed, 18 Jul 2018 06:55:16 -0400 Received: by mail-pf0-f195.google.com with SMTP id l9-v6so1983586pff.9 for ; Wed, 18 Jul 2018 03:18:05 -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=eRDwASIsY8b+RX050eLm0VBB26pLnnPViHoepUqi2Po=; b=ZGq+kwnN0E9i9dy3JvIzgqeCn45XvfDGq/IB4MUI8GiIwX1hAgQx2uAemjCOPGwrTY gwPR4KnTXmBL4BmC8ez/yT+Zp9wfF6Xl8mdE9kLnQ4oGillqRiQ8P2YcHWwK+/N7OH7C tYTdwin4v657p0SDtnVMAzizOTOxPrFNdME4O1GSIGhP6T3dDypSyY6HqQDSZv3grxto rm4K/puEKpdA8Lq49kE1sMlyH/Yh2okr70ll2G05Z4Meye7kIC0igNKVbWFShm+B8WnK didWlKywzkfqGuunRfXPPGgazIdqz0RKoGK1ai10Z319G1Cl+adg/uCGC97PB30HenX1 IIkg== 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=eRDwASIsY8b+RX050eLm0VBB26pLnnPViHoepUqi2Po=; b=Ixecnn5KigWQuiSvvewQvdntBRD1UDUqGw+k8OF9jVNo1mreiDimlvx2FKchwYEA+4 QFuqMgz42tmAjCi9kiR9Lh+ISzaf1HdTkzZAkwVFtvCbIR1i4U1/LoAVpTRIsCtq2H89 Oaqe6l6meiwtJQnq8f94qrRCfO/tay9EEM+/UZwji/wxnPtC5CazHBxF91qwZXdlIiw2 r1xEdxN/RjjbccxXBy5T/jqBJqVaREoxoyt/pQQDQFQ0X5Y/ZnEG0e586FrRwvQIoZk2 UW3gkl7irqu9kxC0XTa950UuAxIYrQa9xR64WlzUX2br6WAaNfAoGr4D7aB0cvhn4UDs fhfw== X-Gm-Message-State: AOUpUlFx91wbn3gyR42Ho8PnMUZphAVqcJ8DNP/wSJ7n7IODJ/nMYgbm n2rKfBx46bdLlGwx4TTqgjs= X-Google-Smtp-Source: AAOMgpfeiz3tXLB5ESsZXCWZlRF3NLqq6tikDmEZ/vaCylCaT9KQ6FfLldeRHr2VGJcawFqIrjydZg== X-Received: by 2002:a63:5106:: with SMTP id f6-v6mr5078111pgb.95.1531909085434; Wed, 18 Jul 2018 03:18:05 -0700 (PDT) Received: from toy.corp.qihoo.net ([104.192.108.10]) by smtp.gmail.com with ESMTPSA id x2-v6sm6899518pgq.33.2018.07.18.03.18.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 18 Jul 2018 03:18:05 -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: [RESEND PATCH v4 4/6] arm64/mm: Make swapper_pg_dir smaller Date: Wed, 18 Jul 2018 18:17:25 +0800 Message-Id: <20180718101727.10787-5-yaojun8558363@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180718101727.10787-1-yaojun8558363@gmail.com> References: <20180718101727.10787-1-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 088a591e4ea4..1d16104aa0b9 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(lm_alias(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); } void __init set_init_mm_pgd(pgd_t *pgd) -- 2.17.1