From patchwork Thu Mar 21 14:19:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 10863651 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8C60914DE for ; Thu, 21 Mar 2019 14:21:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 795CC292FA for ; Thu, 21 Mar 2019 14:21:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6D0172A2A9; Thu, 21 Mar 2019 14:21:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0E0162A2A4 for ; Thu, 21 Mar 2019 14:21:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728386AbfCUOUS (ORCPT ); Thu, 21 Mar 2019 10:20:18 -0400 Received: from foss.arm.com ([217.140.101.70]:56944 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727823AbfCUOUR (ORCPT ); Thu, 21 Mar 2019 10:20:17 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5957680D; Thu, 21 Mar 2019 07:20:17 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 84C153F575; Thu, 21 Mar 2019 07:20:13 -0700 (PDT) From: Steven Price To: linux-mm@kvack.org Cc: Steven Price , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Peter Zijlstra , Thomas Gleixner , Will Deacon , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" , Ralf Baechle , Paul Burton , James Hogan , linux-mips@vger.kernel.org Subject: [PATCH v5 03/19] mips: mm: Add p?d_large() definitions Date: Thu, 21 Mar 2019 14:19:37 +0000 Message-Id: <20190321141953.31960-4-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190321141953.31960-1-steven.price@arm.com> References: <20190321141953.31960-1-steven.price@arm.com> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP walk_page_range() is going to be allowed to walk page tables other than those of user space. For this it needs to know when it has reached a 'leaf' entry in the page tables. This information is provided by the p?d_large() functions/macros. For mips, we only support large pages on 64 bit. For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not defined we can be confident that there are no large pages in existence and fall back on the generic implementation (added in a later patch) which returns 0. CC: Ralf Baechle CC: Paul Burton CC: James Hogan CC: linux-mips@vger.kernel.org Signed-off-by: Steven Price Acked-by: Paul Burton --- arch/mips/include/asm/pgtable-64.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 93a9dce31f25..42162877ac62 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd) return pmd_val(pmd) != (unsigned long) invalid_pte_table; } +#ifdef _PAGE_HUGE +#define pmd_large(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) +#endif + static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); @@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud) return pud_val(pud) != (unsigned long) invalid_pmd_table; } +#ifdef _PAGE_HUGE +#define pud_large(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) +#endif + static inline void pud_clear(pud_t *pudp) { pud_val(*pudp) = ((unsigned long) invalid_pmd_table);