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 2FE8AC55183 for ; Tue, 21 Apr 2020 02:35:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EEBC42084D for ; Tue, 21 Apr 2020 02:35:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EEBC42084D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8BEFA8E0006; Mon, 20 Apr 2020 22:35:34 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 847E98E0003; Mon, 20 Apr 2020 22:35:34 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 737F48E0006; Mon, 20 Apr 2020 22:35:34 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0118.hostedemail.com [216.40.44.118]) by kanga.kvack.org (Postfix) with ESMTP id 5BB268E0003 for ; Mon, 20 Apr 2020 22:35:34 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 08A6A181AEF09 for ; Tue, 21 Apr 2020 02:35:34 +0000 (UTC) X-FDA: 76730296188.30.mom89_4da827e2e705a X-HE-Tag: mom89_4da827e2e705a X-Filterd-Recvd-Size: 2346 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf04.hostedemail.com (Postfix) with ESMTP for ; Tue, 21 Apr 2020 02:35:33 +0000 (UTC) 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 B5657C14; Mon, 20 Apr 2020 19:35:32 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.1.9]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 102F73F73D; Mon, 20 Apr 2020 19:35:29 -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 V17 1/2] x86/mm: Define mm_p4d_folded() Date: Tue, 21 Apr 2020 08:04:54 +0530 Message-Id: <1587436495-22033-2-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1587436495-22033-1-git-send-email-anshuman.khandual@arm.com> References: <1587436495-22033-1-git-send-email-anshuman.khandual@arm.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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