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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3500AC433F5 for ; Mon, 24 Jan 2022 12:59:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242990AbiAXM7h (ORCPT ); Mon, 24 Jan 2022 07:59:37 -0500 Received: from foss.arm.com ([217.140.110.172]:33302 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242971AbiAXM7M (ORCPT ); Mon, 24 Jan 2022 07:59:12 -0500 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 490841396; Mon, 24 Jan 2022 04:59:12 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.43.190]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id DCC033F774; Mon, 24 Jan 2022 04:59:09 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, hch@infradead.org, akpm@linux-foundation.org, Anshuman Khandual Subject: [RFC V1 31/31] mm/mmap: Define macros for vm_flags access permission combinations Date: Mon, 24 Jan 2022 18:27:08 +0530 Message-Id: <1643029028-12710-32-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com> References: <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These macros will be useful in cleaning up the all those switch statements in vm_get_page_prot() across all platforms. Cc: Andrew Morton Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- include/linux/mm.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 6c0844b99b3e..b3691eeec500 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2828,6 +2828,45 @@ static inline bool range_in_vma(struct vm_area_struct *vma, return (vma && vma->vm_start <= start && end <= vma->vm_end); } +/* + * Access permission related vm_flags combination is used to map into + * platform defined page protection flags. This enumeration helps in + * abstracting out possible indices after vm_flags is probed for all + * access permission i.e (VM_SHARED | VM_EXEC | VM_READ | VM_WRITE). + * + * VM_EXEC ---------------------| + * | + * VM_WRITE ---------------| | + * | | + * VM_READ -----------| | | + * | | | + * VM_SHARED ----| | | | + * | | | | + * v v v v + * VMFLAGS_IDX_(S|X)(R|X)(W|X)(E|X) + * + * X - Indicates that the access flag is absent + */ +enum vmflags_idx { + VMFLAGS_IDX_XXXX, /* (VM_NONE) */ + VMFLAGS_IDX_XRXX, /* (VM_READ) */ + VMFLAGS_IDX_XXWX, /* (VM_WRITE) */ + VMFLAGS_IDX_XRWX, /* (VM_READ | VM_WRITE) */ + VMFLAGS_IDX_XXXE, /* (VM_EXEC) */ + VMFLAGS_IDX_XRXE, /* (VM_EXEC | VM_READ) */ + VMFLAGS_IDX_XXWE, /* (VM_EXEC | VM_WRITE) */ + VMFLAGS_IDX_XRWE, /* (VM_EXEC | VM_READ | VM_WRITE) */ + VMFLAGS_IDX_SXXX, /* (VM_SHARED | VM_NONE) */ + VMFLAGS_IDX_SRXX, /* (VM_SHARED | VM_READ) */ + VMFLAGS_IDX_SXWX, /* (VM_SHARED | VM_WRITE) */ + VMFLAGS_IDX_SRWX, /* (VM_SHARED | VM_READ | VM_WRITE) */ + VMFLAGS_IDX_SXXE, /* (VM_SHARED | VM_EXEC) */ + VMFLAGS_IDX_SRXE, /* (VM_SHARED | VM_EXEC | VM_READ) */ + VMFLAGS_IDX_SXWE, /* (VM_SHARED | VM_EXEC | VM_WRITE) */ + VMFLAGS_IDX_SRWE, /* (VM_SHARED | VM_EXEC | VM_READ | VM_WRITE) */ + VMFLAGS_IDX_MAX +}; + #ifdef CONFIG_MMU pgprot_t vm_get_page_prot(unsigned long vm_flags); void vma_set_page_prot(struct vm_area_struct *vma); -- 2.25.1