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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 E606BC47259 for ; Mon, 4 May 2020 04:01:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CEF4820746 for ; Mon, 4 May 2020 04:01:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727811AbgEDEB5 (ORCPT ); Mon, 4 May 2020 00:01:57 -0400 Received: from foss.arm.com ([217.140.110.172]:36848 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725770AbgEDEBz (ORCPT ); Mon, 4 May 2020 00:01:55 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 675F11045; Sun, 3 May 2020 21:01:55 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.71.79]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C0B563F71F; Sun, 3 May 2020 21:01:52 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Cc: Anshuman Khandual , Thomas Gleixner , Andrew Morton , Ingo Molnar , x86@kernel.org, linux-kernel@vger.kernel.org, "Kirill A . Shutemov" Subject: [PATCH V18 1/2] x86/mm: Define mm_p4d_folded() Date: Mon, 4 May 2020 09:31:04 +0530 Message-Id: <1588564865-31160-2-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1588564865-31160-1-git-send-email-anshuman.khandual@arm.com> References: <1588564865-31160-1-git-send-email-anshuman.khandual@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This just defines mm_p4d_folded() to check whether P4D page table level is folded at runtime. Cc: Thomas Gleixner Cc: Andrew Morton Cc: Ingo Molnar Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Kirill A. Shutemov Signed-off-by: Anshuman Khandual --- arch/x86/include/asm/pgtable_64.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h index df1373415f11..8d03ffd43794 100644 --- a/arch/x86/include/asm/pgtable_64.h +++ b/arch/x86/include/asm/pgtable_64.h @@ -53,6 +53,12 @@ static inline void sync_initial_page_table(void) { } struct mm_struct; +#define mm_p4d_folded mm_p4d_folded +static inline bool mm_p4d_folded(struct mm_struct *mm) +{ + return !pgtable_l5_enabled(); +} + void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte); void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte); -- 2.20.1