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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 CD999C433E6 for ; Wed, 24 Feb 2021 20:08:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F0E064F09 for ; Wed, 24 Feb 2021 20:08:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235374AbhBXUIR (ORCPT ); Wed, 24 Feb 2021 15:08:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:59602 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235291AbhBXUH2 (ORCPT ); Wed, 24 Feb 2021 15:07:28 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4F29D64E6C; Wed, 24 Feb 2021 20:06:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1614197207; bh=ExvbAqaH3jEwzhaUnfNFLwu8yOToxp3gruKqvmvQXso=; h=Date:From:To:Subject:In-Reply-To:From; b=Pa+TGNiTyxleaNzoer7qAKcCG+ZBTxGB673cHipDA7S0MFKkBuf/lEtNdiREylVmd WtA4FRWyjDmDYx0FjKnYV+kWpZSUWw+5/IiufYy3V5T9yz/M+XXD3FdUoRxsrS61Y8 rOOaRRsx6Jqqe7J7/s0crY3arPe2a6g0XkSooOao= Date: Wed, 24 Feb 2021 12:06:46 -0800 From: Andrew Morton To: akpm@linux-foundation.org, anshuman.khandual@arm.com, dansilsby@gmail.com, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, maobibo@loongson.cn, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, paulburton@kernel.org, ralf@linux-mips.org, rppt@linux.ibm.com, torvalds@linux-foundation.org, tsbogend@alpha.franken.de Subject: [patch 112/173] MIPS: do not call flush_tlb_all when setting pmd entry Message-ID: <20210224200646.TrJOnYm-B%akpm@linux-foundation.org> In-Reply-To: <20210224115824.1e289a6895087f10c41dd8d6@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Bibo Mao Subject: MIPS: do not call flush_tlb_all when setting pmd entry Function set_pmd_at is to set pmd entry, if tlb entry need to be flushed, there exists pmdp_huge_clear_flush alike function before set_pmd_at is called. So it is not necessary to call flush_tlb_all in this function. In these scenarios, tlb for the pmd range needs to be flushed: 1. privilege degrade such as wrprotect is set on the pmd entry 2. pmd entry is cleared 3. there is exception if set_pmd_at is issued by dup_mmap, since flush_tlb_mm is called for parent process, it is not necessary to flush tlb in function copy_huge_pmd. Link: http://lkml.kernel.org/r/1592990792-1923-3-git-send-email-maobibo@loongson.cn Signed-off-by: Bibo Mao Cc: Anshuman Khandual Cc: Daniel Silsby Cc: "Kirill A. Shutemov" Cc: Mike Kravetz Cc: Mike Rapoport Cc: Paul Burton Cc: Ralf Baechle Cc: Thomas Bogendoerfer Signed-off-by: Andrew Morton --- arch/mips/mm/pgtable-32.c | 1 - arch/mips/mm/pgtable-64.c | 1 - 2 files changed, 2 deletions(-) --- a/arch/mips/mm/pgtable-32.c~mips-do-not-call-flush_tlb_all-when-setting-pmd-entry +++ a/arch/mips/mm/pgtable-32.c @@ -45,7 +45,6 @@ void set_pmd_at(struct mm_struct *mm, un pmd_t *pmdp, pmd_t pmd) { *pmdp = pmd; - flush_tlb_all(); } #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */ --- a/arch/mips/mm/pgtable-64.c~mips-do-not-call-flush_tlb_all-when-setting-pmd-entry +++ a/arch/mips/mm/pgtable-64.c @@ -100,7 +100,6 @@ void set_pmd_at(struct mm_struct *mm, un pmd_t *pmdp, pmd_t pmd) { *pmdp = pmd; - flush_tlb_all(); } void __init pagetable_init(void) _