From patchwork Thu Oct 24 09:36:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 11208687 X-Patchwork-Delegate: paulburton@kernel.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 23C42112C for ; Thu, 24 Oct 2019 09:38:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0CE1F21872 for ; Thu, 24 Oct 2019 09:38:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438597AbfJXJh6 (ORCPT ); Thu, 24 Oct 2019 05:37:58 -0400 Received: from foss.arm.com ([217.140.110.172]:44444 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438594AbfJXJh6 (ORCPT ); Thu, 24 Oct 2019 05:37:58 -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 C656C492; Thu, 24 Oct 2019 02:37:42 -0700 (PDT) Received: from e112269-lin.cambridge.arm.com (e112269-lin.cambridge.arm.com [10.1.194.43]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C52B33F71F; Thu, 24 Oct 2019 02:37:39 -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" , Andrew Morton , Ralf Baechle , Paul Burton , James Hogan , linux-mips@vger.kernel.org Subject: [PATCH v13 05/22] mips: mm: Add p?d_leaf() definitions Date: Thu, 24 Oct 2019 10:36:59 +0100 Message-Id: <20191024093716.49420-6-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191024093716.49420-1-steven.price@arm.com> References: <20191024093716.49420-1-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 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_leaf() functions/macros. If _PAGE_HUGE is defined we can simply look for it. When not defined we can be confident that there are no leaf 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.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index f85bd5b15f51..fff392ea80c7 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -639,6 +639,11 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#ifdef _PAGE_HUGE +#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) +#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) +#endif + #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases) #include