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=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 B7B9EECE563 for ; Mon, 17 Sep 2018 04:44:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E1EE2086B for ; Mon, 17 Sep 2018 04:44:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="SlATow9g" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6E1EE2086B 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 S1728573AbeIQKJx (ORCPT ); Mon, 17 Sep 2018 06:09:53 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:43731 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726113AbeIQKJx (ORCPT ); Mon, 17 Sep 2018 06:09:53 -0400 Received: by mail-pg1-f195.google.com with SMTP id v66-v6so7031924pgb.10 for ; Sun, 16 Sep 2018 21:44:16 -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=PuLa06lO0jfsyCXAVeGXqVVVMPIP4UQbMjn2YuVpDmA=; b=SlATow9g7jrYPGE+tll5JZkbkXydsyc4dC/AI8W3mt6Jhpo60efQbWQTKlWglCrbPr Dl4D060o0HgJpNMvfTT8G0ciciSTpA+qosEhDf00enGQh7V+hcRqeuChWii+behZYjSZ OSPDsmxzVSzCSYRWSiGZijfC0S1/EHhV/Vzdfb1giWqjhFBUviHUKuKGN8YRTQi45NGr oahuZA2RwkgdKraO8icZ2nvbuZSjHRI0SQSgFz2Jx/6iByvhTLvO7UkDPItHdphHgNDH aVaeMDcp2X0g5ATbzcttD0E1iDUNaANuyO+mOpTSwQYzjzB+6vPc3IkVvNpVD4g9Fw3P 9j4g== 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=PuLa06lO0jfsyCXAVeGXqVVVMPIP4UQbMjn2YuVpDmA=; b=BSkPMsvp9NEXp0I0b5aJs9zzF/LYGFJ6QxWpTrjM3hMckoEq4rYzZ4xwe5myIuhHOo bB/o7N2ohQt77mQK2/H6JECAHi8wevvKYYFeiHZrE5TXm7QwLGRWdZfJxXhIYds5N30h Wi2kt7oddZVhg9z+PjmjIAaGgjSXAtP3/+mx+AIktmnUVVuoo7jXhXtuJqJR4IqqRn+d 2PuHz52N9y9svSPV54pMHK08+aAf3b5vv04eiD91cjBorhIN5u604/cL230V1E2K/pU6 qPE3xFrRsAUNZ41st/KifqoZ7bdUXk8zzx3lHdvKSWp/7ODn7wn0qjFRAedyZiqp+Xas R2bQ== X-Gm-Message-State: APzg51BmcTIczSq0lmyXqR6HMsl3u0BGnD3KhqcoLMlsdHWAPnukQTeX n670vKfLD4HDVvkvwGrOjfHF5rItblw= X-Google-Smtp-Source: ANB0VdZ9GsvddCJdKBBbTGUGlxc+ErMrFraxpxKYHaGcwKkG32jjDeARlRpGuLjphAvNFaxY+sclEA== X-Received: by 2002:a63:7353:: with SMTP id d19-v6mr21637954pgn.281.1537159455773; Sun, 16 Sep 2018 21:44:15 -0700 (PDT) Received: from toy.corp.qihoo.net ([104.192.108.9]) by smtp.gmail.com with ESMTPSA id l3-v6sm16876399pff.8.2018.09.16.21.44.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 16 Sep 2018 21:44:15 -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 v5 6/6] arm64/mm: Move {idmap_pg_dir .. swapper_pg_dir} to rodata section. Date: Mon, 17 Sep 2018 12:43:33 +0800 Message-Id: <20180917044333.30051-7-yaojun8558363@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180917044333.30051-1-yaojun8558363@gmail.com> References: <20180917044333.30051-1-yaojun8558363@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Move the idmap_pg_dir/tramp_pg_dir/reserved_ttbr0/swapper_pg_dir to the rodata section. When the kernel is initialized, the idmap_pg_dir, tramp_pg_dir and reserved_ttbr0 will not change. And it's safe to move them to rodata section. Signed-off-by: Jun Yao --- arch/arm64/kernel/vmlinux.lds.S | 39 ++++++++++++++++++++------------- 1 file changed, 24 insertions(+), 15 deletions(-) diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index a634def77442..328925b308fc 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -64,8 +64,13 @@ jiffies = jiffies_64; *(.entry.tramp.text) \ . = ALIGN(PAGE_SIZE); \ __entry_tramp_text_end = .; + +#define TRAMP_PG_TABLE \ + tramp_pg_dir = .; \ + . += PAGE_SIZE; #else #define TRAMP_TEXT +#define TRAMP_PG_TABLE #endif #define INIT_PG_TABLES \ @@ -74,6 +79,24 @@ jiffies = jiffies_64; . += SWAPPER_DIR_SIZE; \ init_pg_end = .; +#ifdef CONFIG_ARM64_SW_TTBR0_PAN +#define RESERVED_PG_TABLE \ + reserved_ttbr0 = .; \ + . += RESERVED_TTBR0_SIZE; +#else +#define RESERVED_PG_TABLE +#endif + +#define KERNEL_PG_TABLES \ + . = ALIGN(PAGE_SIZE); \ + idmap_pg_dir = .; \ + . += IDMAP_DIR_SIZE; \ + TRAMP_PG_TABLE \ + RESERVED_PG_TABLE \ + swapper_pg_dir = .; \ + . += PAGE_SIZE; \ + swapper_pg_end = .; + /* * The size of the PE/COFF section that covers the kernel image, which * runs from stext to _edata, must be a round multiple of the PE/COFF @@ -143,6 +166,7 @@ SECTIONS RO_DATA(PAGE_SIZE) /* everything from this point to */ EXCEPTION_TABLE(8) /* __init_begin will be marked RO NX */ NOTES + KERNEL_PG_TABLES . = ALIGN(SEGMENT_ALIGN); __init_begin = .; @@ -224,21 +248,6 @@ SECTIONS BSS_SECTION(0, 0, 0) . = ALIGN(PAGE_SIZE); - idmap_pg_dir = .; - . += IDMAP_DIR_SIZE; - -#ifdef CONFIG_UNMAP_KERNEL_AT_EL0 - tramp_pg_dir = .; - . += PAGE_SIZE; -#endif - -#ifdef CONFIG_ARM64_SW_TTBR0_PAN - reserved_ttbr0 = .; - . += RESERVED_TTBR0_SIZE; -#endif - swapper_pg_dir = .; - . += PAGE_SIZE; - swapper_pg_end = .; __pecoff_data_size = ABSOLUTE(. - __initdata_begin); _end = .; -- 2.17.1