From patchwork Mon Feb 14 02:30:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 12744789 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F2BAFC433F5 for ; Mon, 14 Feb 2022 02:33:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=i/M4bKq+6IFE34ry7BejdF1+YtnhDbNdjdxVZmx37R4=; b=bW/1JyhTVzx4Is easd03sIor5y0uM5IpkuUBkWTpagqu5ysxDM/aj2RG/n8zn2vwI8iYgx1Erx20kQVYPGFXzQA0Z/z SMmGAPfKdW9ry92SV3yzK+kdXkNzb6mzw6c2TU931eZdunLbJBMmPU7znntZnb6j0B45NYg/HOVpw tMsDoZMM8trOASr2K7bTL5Mfg+nWwgICpTTEFMvs4C9DHGAitZDmOgYN8xPFSbVnQSU16tm3SXBR1 3XywTxdf5b7hy3YNfmeuIM8wryDROZkn1mrB9FyMhSoUNe0iZrAFrw5pqaaG2WR7Fx8VtIrd4idVG ySfDrfjy/Zjf5SrSsmKg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJR9A-00D0HD-H6; Mon, 14 Feb 2022 02:31:24 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJR96-00D0FM-IA for linux-arm-kernel@lists.infradead.org; Mon, 14 Feb 2022 02:31:22 +0000 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 36EAA106F; Sun, 13 Feb 2022 18:31:19 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.47.15]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id F1D843F718; Sun, 13 Feb 2022 18:31:15 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Anshuman Khandual , Christoph Hellwig , Andrew Morton , linux-arch@vger.kernel.org, Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/30] arm64/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Date: Mon, 14 Feb 2022 08:00:28 +0530 Message-Id: <1644805853-21338-6-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1644805853-21338-1-git-send-email-anshuman.khandual@arm.com> References: <1644805853-21338-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220213_183120_699394_599EB4C2 X-CRM114-Status: GOOD ( 18.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This defines and exports a platform specific custom vm_get_page_prot() via subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX macros can be dropped which are no longer needed. This also localizes both arch_filter_pgprot and arch_vm_get_page_prot() helpers, unsubscribing from ARCH_HAS_FILTER_PGPROT as well. Moved both these localized functions near vm_get_page_prot(). Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/arm64/Kconfig | 2 +- arch/arm64/include/asm/mman.h | 24 --------- arch/arm64/include/asm/pgtable-prot.h | 18 ------- arch/arm64/include/asm/pgtable.h | 11 ---- arch/arm64/mm/mmap.c | 78 +++++++++++++++++++++++++++ 5 files changed, 79 insertions(+), 54 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e2540419ca12..7e36bb32351e 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -23,7 +23,6 @@ config ARM64 select ARCH_HAS_DMA_PREP_COHERENT select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_FAST_MULTIPLIER - select ARCH_HAS_FILTER_PGPROT select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GIGANTIC_PAGE @@ -44,6 +43,7 @@ config ARM64 select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_HAS_ZONE_DMA_SET if EXPERT select ARCH_HAVE_ELF_PROT select ARCH_HAVE_NMI_SAFE_CMPXCHG diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index e3e28f7daf62..5966ee4a6154 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -35,30 +35,6 @@ static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags) } #define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(flags) -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) -{ - pteval_t prot = 0; - - if (vm_flags & VM_ARM64_BTI) - prot |= PTE_GP; - - /* - * There are two conditions required for returning a Normal Tagged - * memory type: (1) the user requested it via PROT_MTE passed to - * mmap() or mprotect() and (2) the corresponding vma supports MTE. We - * register (1) as VM_MTE in the vma->vm_flags and (2) as - * VM_MTE_ALLOWED. Note that the latter can only be set during the - * mmap() call since mprotect() does not accept MAP_* flags. - * Checking for VM_MTE only is sufficient since arch_validate_flags() - * does not permit (VM_MTE & !VM_MTE_ALLOWED). - */ - if (vm_flags & VM_MTE) - prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED); - - return __pgprot(prot); -} -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) - static inline bool arch_validate_prot(unsigned long prot, unsigned long addr __always_unused) { diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h index 7032f04c8ac6..d8ee0aa7886d 100644 --- a/arch/arm64/include/asm/pgtable-prot.h +++ b/arch/arm64/include/asm/pgtable-prot.h @@ -88,24 +88,6 @@ extern bool arm64_use_ng_mappings; #define PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_RDONLY | PTE_NG | PTE_PXN) #define PAGE_EXECONLY __pgprot(_PAGE_DEFAULT | PTE_RDONLY | PTE_NG | PTE_PXN) -#define __P000 PAGE_NONE -#define __P001 PAGE_READONLY -#define __P010 PAGE_READONLY -#define __P011 PAGE_READONLY -#define __P100 PAGE_EXECONLY -#define __P101 PAGE_READONLY_EXEC -#define __P110 PAGE_READONLY_EXEC -#define __P111 PAGE_READONLY_EXEC - -#define __S000 PAGE_NONE -#define __S001 PAGE_READONLY -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED -#define __S100 PAGE_EXECONLY -#define __S101 PAGE_READONLY_EXEC -#define __S110 PAGE_SHARED_EXEC -#define __S111 PAGE_SHARED_EXEC - #endif /* __ASSEMBLY__ */ #endif /* __ASM_PGTABLE_PROT_H */ diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index c4ba047a82d2..94e147e5456c 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1017,17 +1017,6 @@ static inline bool arch_wants_old_prefaulted_pte(void) } #define arch_wants_old_prefaulted_pte arch_wants_old_prefaulted_pte -static inline pgprot_t arch_filter_pgprot(pgprot_t prot) -{ - if (cpus_have_const_cap(ARM64_HAS_EPAN)) - return prot; - - if (pgprot_val(prot) != pgprot_val(PAGE_EXECONLY)) - return prot; - - return PAGE_READONLY_EXEC; -} - static inline bool pud_sect_supported(void) { return PAGE_SIZE == SZ_4K; diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index a38f54cd638c..bd0233d376a2 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -10,6 +10,7 @@ #include #include +#include /* * You really shouldn't be using read() or write() on /dev/mem. This might go @@ -38,3 +39,80 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) { return !(((pfn << PAGE_SHIFT) + size) & ~PHYS_MASK); } + +static inline pgprot_t __vm_get_page_prot(unsigned long vm_flags) +{ + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { + case VM_NONE: + return PAGE_NONE; + case VM_READ: + case VM_WRITE: + case VM_WRITE | VM_READ: + return PAGE_READONLY; + case VM_EXEC: + return PAGE_EXECONLY; + case VM_EXEC | VM_READ: + case VM_EXEC | VM_WRITE: + case VM_EXEC | VM_WRITE | VM_READ: + return PAGE_READONLY_EXEC; + case VM_SHARED: + return PAGE_NONE; + case VM_SHARED | VM_READ: + return PAGE_READONLY; + case VM_SHARED | VM_WRITE: + case VM_SHARED | VM_WRITE | VM_READ: + return PAGE_SHARED; + case VM_SHARED | VM_EXEC: + return PAGE_EXECONLY; + case VM_SHARED | VM_EXEC | VM_READ: + return PAGE_READONLY_EXEC; + case VM_SHARED | VM_EXEC | VM_WRITE: + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ: + return PAGE_SHARED_EXEC; + default: + BUILD_BUG(); + } +} + +static pgprot_t arm64_arch_filter_pgprot(pgprot_t prot) +{ + if (cpus_have_const_cap(ARM64_HAS_EPAN)) + return prot; + + if (pgprot_val(prot) != pgprot_val(PAGE_EXECONLY)) + return prot; + + return PAGE_READONLY_EXEC; +} + +static pgprot_t arm64_arch_vm_get_page_prot(unsigned long vm_flags) +{ + pteval_t prot = 0; + + if (vm_flags & VM_ARM64_BTI) + prot |= PTE_GP; + + /* + * There are two conditions required for returning a Normal Tagged + * memory type: (1) the user requested it via PROT_MTE passed to + * mmap() or mprotect() and (2) the corresponding vma supports MTE. We + * register (1) as VM_MTE in the vma->vm_flags and (2) as + * VM_MTE_ALLOWED. Note that the latter can only be set during the + * mmap() call since mprotect() does not accept MAP_* flags. + * Checking for VM_MTE only is sufficient since arch_validate_flags() + * does not permit (VM_MTE & !VM_MTE_ALLOWED). + */ + if (vm_flags & VM_MTE) + prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED); + + return __pgprot(prot); +} + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + pgprot_t ret = __pgprot(pgprot_val(__vm_get_page_prot(vm_flags)) | + pgprot_val(arm64_arch_vm_get_page_prot(vm_flags))); + + return arm64_arch_filter_pgprot(ret); +} +EXPORT_SYMBOL(vm_get_page_prot); From patchwork Mon Feb 14 02:30:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 12744790 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 25B30C433FE for ; Mon, 14 Feb 2022 02:33:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=DuSupnrvm8QNQ3PfXe0P51rtqErwTYX4wn4FI5kS1NY=; b=1qUnLmW5oRBN3c E0GGC+hY1hlVPp6eFFYGnlsdWqtY9ExKMxt9AYM5GXil9b8H6Da6R+Sf8/SzsljIVni9yw+aNUyZS QnA0e5jiZuH86Xi6W7fNlikXqT+3n6tIPTLg9ZADRPk0zx6Sf+hUUmh76r7J9RGHkx92YREpUsv8R JJU2mud+008Bjfak8XaIFAy6Ombb3+tu9sJ2f63ZudUChJyocOgI56rBiVFVR8GCpwGgF1luQMB4u ObtEiSb1l2odcQZMWpB1kA3vHSW7vwsd+qC/wlPobIbYBkEjXeUnJkPEj0gkuDZbloLOiBOZ9KnYO PXoH2lrB665IGgEPZK0A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJR9N-00D0Ok-2G; Mon, 14 Feb 2022 02:31:37 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJR9I-00D0L7-Df for linux-arm-kernel@lists.infradead.org; Mon, 14 Feb 2022 02:31:34 +0000 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 C72D1ED1; Sun, 13 Feb 2022 18:31:31 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.47.15]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 0A48D3F718; Sun, 13 Feb 2022 18:31:28 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Anshuman Khandual , Christoph Hellwig , Andrew Morton , linux-arch@vger.kernel.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org Subject: [PATCH 09/30] arm/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Date: Mon, 14 Feb 2022 08:00:32 +0530 Message-Id: <1644805853-21338-10-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1644805853-21338-1-git-send-email-anshuman.khandual@arm.com> References: <1644805853-21338-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220213_183132_590435_8BEBA229 X-CRM114-Status: GOOD ( 15.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This defines and exports a platform specific custom vm_get_page_prot() via subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX macros can be dropped which are no longer needed. Cc: Russell King Cc: Arnd Bergmann Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/arm/Kconfig | 1 + arch/arm/include/asm/pgtable.h | 18 -------------- arch/arm/mm/mmu.c | 44 +++++++++++++++++++++++++++++----- 3 files changed, 39 insertions(+), 24 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 4c97cb40eebb..87b2e89ef3d6 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -23,6 +23,7 @@ config ARM select ARCH_HAS_SYNC_DMA_FOR_CPU if SWIOTLB || !MMU select ARCH_HAS_TEARDOWN_DMA_OPS if MMU select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_HAVE_CUSTOM_GPIO_H select ARCH_HAVE_NMI_SAFE_CMPXCHG if CPU_V7 || CPU_V7M || CPU_V6K select ARCH_HAS_GCOV_PROFILE_ALL diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index cd1f84bb40ae..ec062dd6082a 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -137,24 +137,6 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, * 2) If we could do execute protection, then read is implied * 3) write implies read permissions */ -#define __P000 __PAGE_NONE -#define __P001 __PAGE_READONLY -#define __P010 __PAGE_COPY -#define __P011 __PAGE_COPY -#define __P100 __PAGE_READONLY_EXEC -#define __P101 __PAGE_READONLY_EXEC -#define __P110 __PAGE_COPY_EXEC -#define __P111 __PAGE_COPY_EXEC - -#define __S000 __PAGE_NONE -#define __S001 __PAGE_READONLY -#define __S010 __PAGE_SHARED -#define __S011 __PAGE_SHARED -#define __S100 __PAGE_READONLY_EXEC -#define __S101 __PAGE_READONLY_EXEC -#define __S110 __PAGE_SHARED_EXEC -#define __S111 __PAGE_SHARED_EXEC - #ifndef __ASSEMBLY__ /* * ZERO_PAGE is a global shared page that is always zero: used diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 274e4f73fd33..9cdf45da57de 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -403,6 +403,8 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE); } +static pteval_t user_pgprot; + /* * Adjust the PMD section entries according to the CPU in use. */ @@ -410,7 +412,7 @@ static void __init build_mem_type_table(void) { struct cachepolicy *cp; unsigned int cr = get_cr(); - pteval_t user_pgprot, kern_pgprot, vecs_pgprot; + pteval_t kern_pgprot, vecs_pgprot; int cpu_arch = cpu_architecture(); int i; @@ -627,11 +629,6 @@ static void __init build_mem_type_table(void) user_pgprot |= PTE_EXT_PXN; #endif - for (i = 0; i < 16; i++) { - pteval_t v = pgprot_val(protection_map[i]); - protection_map[i] = __pgprot(v | user_pgprot); - } - mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot; mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot; @@ -670,6 +667,41 @@ static void __init build_mem_type_table(void) } } +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { + case VM_NONE: + return __pgprot(pgprot_val(__PAGE_NONE) | user_pgprot); + case VM_READ: + return __pgprot(pgprot_val(__PAGE_READONLY) | user_pgprot); + case VM_WRITE: + case VM_WRITE | VM_READ: + return __pgprot(pgprot_val(__PAGE_COPY) | user_pgprot); + case VM_EXEC: + case VM_EXEC | VM_READ: + return __pgprot(pgprot_val(__PAGE_READONLY_EXEC) | user_pgprot); + case VM_EXEC | VM_WRITE: + case VM_EXEC | VM_WRITE | VM_READ: + return __pgprot(pgprot_val(__PAGE_COPY_EXEC) | user_pgprot); + case VM_SHARED: + return __pgprot(pgprot_val(__PAGE_NONE) | user_pgprot); + case VM_SHARED | VM_READ: + return __pgprot(pgprot_val(__PAGE_READONLY) | user_pgprot); + case VM_SHARED | VM_WRITE: + case VM_SHARED | VM_WRITE | VM_READ: + return __pgprot(pgprot_val(__PAGE_SHARED) | user_pgprot); + case VM_SHARED | VM_EXEC: + case VM_SHARED | VM_EXEC | VM_READ: + return __pgprot(pgprot_val(__PAGE_READONLY_EXEC) | user_pgprot); + case VM_SHARED | VM_EXEC | VM_WRITE: + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ: + return __pgprot(pgprot_val(__PAGE_SHARED_EXEC) | user_pgprot); + default: + BUILD_BUG(); + } +} +EXPORT_SYMBOL(vm_get_page_prot); + #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t vma_prot)