From patchwork Mon Apr 3 15:19:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 96647 Delivered-To: patch@linaro.org Received: by 10.140.89.233 with SMTP id v96csp148182qgd; Mon, 3 Apr 2017 08:20:27 -0700 (PDT) X-Received: by 10.99.178.19 with SMTP id x19mr18367699pge.122.1491232827179; Mon, 03 Apr 2017 08:20:27 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f7si14619505pfd.13.2017.04.03.08.20.26; Mon, 03 Apr 2017 08:20:27 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753845AbdDCPUH (ORCPT + 25 others); Mon, 3 Apr 2017 11:20:07 -0400 Received: from foss.arm.com ([217.140.101.70]:60394 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753801AbdDCPT5 (ORCPT ); Mon, 3 Apr 2017 11:19:57 -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 15F6F80D; Mon, 3 Apr 2017 08:19:57 -0700 (PDT) Received: from leverpostej.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3B41F3F4FF; Mon, 3 Apr 2017 08:19:55 -0700 (PDT) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, arnd@arndb.de, catalin.marinas@arm.com, christoffer.dall@linaro.org, jiong.wang@arm.com, kvmarm@lists.cs.columbia.edu, linux-arch@vger.kernel.org, marc.zyngier@arm.com, mark.rutland@arm.com, suzuki.poulose@arm.com, will.deacon@arm.com Subject: [RFC 1/9] asm-generic: mm_hooks: allow hooks to be overridden individually Date: Mon, 3 Apr 2017 16:19:17 +0100 Message-Id: <1491232765-32501-2-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1491232765-32501-1-git-send-email-mark.rutland@arm.com> References: <1491232765-32501-1-git-send-email-mark.rutland@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, an architecture must either implement all of the mm hooks itself, or use all of those provided by the asm-generic implementation. When an architecture only needs to override a single hook, it must copy the stub implementations from the asm-generic version. To avoid this repetition, allow each hook to be overridden indiviually, by placing each under an #ifndef block. As architectures providing their own hooks can't include this file today, this shouldn't adversely affect any existing hooks. Signed-off-by: Mark Rutland Cc: Arnd Bergmann Cc: linux-arch@vger.kernel.org --- include/asm-generic/mm_hooks.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) -- 1.9.1 diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h index cc5d9a1..c5a4328 100644 --- a/include/asm-generic/mm_hooks.h +++ b/include/asm-generic/mm_hooks.h @@ -6,36 +6,48 @@ #ifndef _ASM_GENERIC_MM_HOOKS_H #define _ASM_GENERIC_MM_HOOKS_H +#ifndef arch_dup_mmap static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) { } +#endif +#ifndef arch_exit_mmap static inline void arch_exit_mmap(struct mm_struct *mm) { } +#endif +#ifndef arch_unmap static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long start, unsigned long end) { } +#endif +#ifndef arch_bprm_mm_init static inline void arch_bprm_mm_init(struct mm_struct *mm, struct vm_area_struct *vma) { } +#endif +#ifndef arch_vma_access_permitted static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, bool execute, bool foreign) { /* by default, allow everything */ return true; } +#endif +#ifndef arch_pte_access_permitted static inline bool arch_pte_access_permitted(pte_t pte, bool write) { /* by default, allow everything */ return true; } +#endif #endif /* _ASM_GENERIC_MM_HOOKS_H */