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=-16.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 50D26C43381 for ; Mon, 18 Feb 2019 23:13:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 22535218AD for ; Mon, 18 Feb 2019 23:13:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="bsfGy1P+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731942AbfBRXNd (ORCPT ); Mon, 18 Feb 2019 18:13:33 -0500 Received: from mail-it1-f194.google.com ([209.85.166.194]:36591 "EHLO mail-it1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730200AbfBRXN0 (ORCPT ); Mon, 18 Feb 2019 18:13:26 -0500 Received: by mail-it1-f194.google.com with SMTP id h6so1953726itl.1 for ; Mon, 18 Feb 2019 15:13:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=V1IdqbYubtCixESl5TR0muUvkg/E2O8mQvzM202vMJY=; b=bsfGy1P+JAaNzK2xsZmC2Tj104zGh/lur1QTBqvenBJ2/qYq2g/zlrWxNZQtQfM35p SvHcbH51aav58mTv6SC3r+eXafQV/q2wT7dySMfLdYtqGwd3IU4BO5OncxK0Sc1m+fIj nQfKurxrxsrekUV5Engn2LJyRILWrYvwJyz5n0SWzgddARHKb325HaCw91Il4vDU1Zx/ mk9/PYlyIFAHhkP2hr5znpaOUFZOUpl6KFCa/NcBzVtwHJoN4RB7/T7YpN2vbUZpYTCL LQgIbfhf2ht7PVFcOoXfG78S2gMcj0aiK0WoV3lEAuUhwncWxtNbknbhAN1dIFxSI790 gxtw== 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:mime-version:content-transfer-encoding; bh=V1IdqbYubtCixESl5TR0muUvkg/E2O8mQvzM202vMJY=; b=ix+/27a2sxe0Lzn+2iN5AZYN1ROeWhA2bMgthcuZFWOK5mY3oqMUEoUD/MhcQWrTA+ S2BtF/viW78JDcPsk7PwVcuZP5iQCyGdlm6/UpKQ5Ob0c2BMmr4Fho6FgZfUPYl+5KId lSXlQe5eAt9zIEyq+aYt9UiwzgjFkHMQXcogFgooPHQWWheC58cppSamkm99sJu6d/Xx yS8zvkDuUxNfoJZ5vBxts+dMIItrwmLAQVON7MAUh2BCDMKX/SwKYd9dMIOcBcqphdI7 FVj6IckJVzxwStZKN7c3dCjv7KMuKGt+Gsyl5c1BHt/13rEDjFtPXbgKC2acfYRYkzlG frlQ== X-Gm-Message-State: AHQUAuapBi6WCXO6p6LGi7gJzJrqR5YKdI+rPHed7J6XYCqTly82Ws3D 6JZdhtVdtP+EZhy7+q2ps9/rpQ== X-Google-Smtp-Source: AHgI3IZT6Mu4hL5CdKV5I1EiL7aKLnA6dLePkX8jtfw/N38Liese0eXKCRasVCtk+AF0ZUvijxlkeQ== X-Received: by 2002:a24:7d88:: with SMTP id b130mr796701itc.163.1550531606189; Mon, 18 Feb 2019 15:13:26 -0800 (PST) Received: from yuzhao.bld.corp.google.com ([2620:15c:183:0:a0c3:519e:9276:fc96]) by smtp.gmail.com with ESMTPSA id x23sm6541463ion.38.2019.02.18.15.13.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 18 Feb 2019 15:13:25 -0800 (PST) From: Yu Zhao To: Catalin Marinas , Will Deacon Cc: "Aneesh Kumar K . V" , Andrew Morton , Nick Piggin , Peter Zijlstra , Joel Fernandes , "Kirill A . Shutemov" , Mark Rutland , Ard Biesheuvel , Chintan Pandya , Jun Yao , Laura Abbott , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, Yu Zhao Subject: [PATCH v2 2/3] arm64: mm: don't call page table ctors for init_mm Date: Mon, 18 Feb 2019 16:13:18 -0700 Message-Id: <20190218231319.178224-2-yuzhao@google.com> X-Mailer: git-send-email 2.21.0.rc0.258.g878e2cd30e-goog In-Reply-To: <20190218231319.178224-1-yuzhao@google.com> References: <20190214211642.2200-1-yuzhao@google.com> <20190218231319.178224-1-yuzhao@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org init_mm doesn't require page table lock to be initialized at any level. Add a separate page table allocator for it, and the new one skips page table ctors. The ctors allocate memory when ALLOC_SPLIT_PTLOCKS is set. Not calling them avoids memory leak in case we call pte_free_kernel() on init_mm. Signed-off-by: Yu Zhao --- arch/arm64/mm/mmu.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index fa7351877af3..e8bf8a6300e8 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -370,6 +370,16 @@ static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, } while (pgdp++, addr = next, addr != end); } +static phys_addr_t pgd_kernel_pgtable_alloc(int shift) +{ + void *ptr = (void *)__get_free_page(PGALLOC_GFP); + BUG_ON(!ptr); + + /* Ensure the zeroed page is visible to the page table walker */ + dsb(ishst); + return __pa(ptr); +} + static phys_addr_t pgd_pgtable_alloc(int shift) { void *ptr = (void *)__get_free_page(PGALLOC_GFP); @@ -591,7 +601,7 @@ static int __init map_entry_trampoline(void) /* Map only the text into the trampoline page table */ memset(tramp_pg_dir, 0, PGD_SIZE); __create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS, PAGE_SIZE, - prot, pgd_pgtable_alloc, 0); + prot, pgd_kernel_pgtable_alloc, 0); /* Map both the text and data into the kernel page table */ __set_fixmap(FIX_ENTRY_TRAMP_TEXT, pa_start, prot); @@ -1067,7 +1077,8 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; __create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start), - size, PAGE_KERNEL, pgd_pgtable_alloc, flags); + size, PAGE_KERNEL, pgd_kernel_pgtable_alloc, + flags); return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap, want_memblock); -- 2.21.0.rc0.258.g878e2cd30e-goog