mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
3a6455d56b
In order to be able to do this, we need to change VM_DATA_DEFAULT_FLAGS and friends and update the architecture-specific definitions also. We then have to update some KSM logic to handle VMA flags, and introduce VMA_STACK_FLAGS to define the vma_flags_t equivalent of VM_STACK_FLAGS. We also introduce two helper functions for use during the time we are converting legacy flags to vma_flags_t values - vma_flags_to_legacy() and legacy_to_vma_flags(). This enables us to iteratively make changes to break these changes up into separate parts. We use these explicitly here to keep VM_STACK_FLAGS around for certain users which need to maintain the legacy vm_flags_t values for the time being. We are no longer able to rely on the simple VM_xxx being set to zero if the feature is not enabled, so in the case of VM_DROPPABLE we introduce VMA_DROPPABLE as the vma_flags_t equivalent, which is set to EMPTY_VMA_FLAGS if the droppable flag is not available. While we're here, we make the description of do_brk_flags() into a kdoc comment, as it almost was already. We use vma_flags_to_legacy() to not need to update the vm_get_page_prot() logic as this time. Note that in create_init_stack_vma() we have to replace the BUILD_BUG_ON() with a VM_WARN_ON_ONCE() as the tested values are no longer build time available. We also update mprotect_fixup() to use VMA flags where possible, though we have to live with a little duplication between vm_flags_t and vma_flags_t values for the time being until further conversions are made. While we're here, update VM_SPECIAL to be defined in terms of VMA_SPECIAL_FLAGS now we have vma_flags_to_legacy(). Finally, we update the VMA tests to reflect these changes. Link: https://lkml.kernel.org/r/d02e3e45d9a33d7904b149f5604904089fd640ae.1774034900.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Acked-by: Paul Moore <paul@paul-moore.com> [SELinux] Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Ondrej Mosnacek <omosnace@redhat.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stephen Smalley <stephen.smalley.work@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: xu xin <xu.xin16@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
|
* Copyright (C) 2004 Microtronix Datacom Ltd.
|
|
*
|
|
* MMU support based on asm/page.h from mips which is:
|
|
*
|
|
* Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_NIOS2_PAGE_H
|
|
#define _ASM_NIOS2_PAGE_H
|
|
|
|
#include <linux/pfn.h>
|
|
#include <linux/const.h>
|
|
|
|
#include <vdso/page.h>
|
|
|
|
/*
|
|
* PAGE_OFFSET -- the first address of the first page of memory.
|
|
*/
|
|
#define PAGE_OFFSET \
|
|
(CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
|
|
|
|
#ifndef __ASSEMBLER__
|
|
|
|
/*
|
|
* This gives the physical RAM offset.
|
|
*/
|
|
#define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE
|
|
|
|
/*
|
|
* It's normally defined only for FLATMEM config but it's
|
|
* used in our early mem init code for all memory models.
|
|
* So always define it.
|
|
*/
|
|
#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
|
|
|
|
#define clear_page(page) memset((page), 0, PAGE_SIZE)
|
|
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
|
|
|
|
struct page;
|
|
|
|
#define clear_user_page clear_user_page
|
|
extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
|
|
extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
|
|
struct page *to);
|
|
|
|
/*
|
|
* These are used to make use of C type-checking.
|
|
*/
|
|
typedef struct page *pgtable_t;
|
|
typedef struct { unsigned long pte; } pte_t;
|
|
typedef struct { unsigned long pgd; } pgd_t;
|
|
typedef struct { unsigned long pgprot; } pgprot_t;
|
|
|
|
#define pte_val(x) ((x).pte)
|
|
#define pgd_val(x) ((x).pgd)
|
|
#define pgprot_val(x) ((x).pgprot)
|
|
|
|
#define __pte(x) ((pte_t) { (x) })
|
|
#define __pgd(x) ((pgd_t) { (x) })
|
|
#define __pgprot(x) ((pgprot_t) { (x) })
|
|
|
|
extern unsigned long memory_start;
|
|
extern unsigned long memory_end;
|
|
extern unsigned long memory_size;
|
|
|
|
extern struct page *mem_map;
|
|
|
|
# define __pa(x) \
|
|
((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
|
|
# define __va(x) \
|
|
((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
|
|
|
|
#define page_to_virt(page) \
|
|
((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
|
|
|
|
# define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
|
|
|
|
# define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
|
|
# define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
|
|
|
|
# define VMA_DATA_DEFAULT_FLAGS VMA_DATA_FLAGS_NON_EXEC
|
|
|
|
#include <asm-generic/memory_model.h>
|
|
|
|
#include <asm-generic/getorder.h>
|
|
|
|
#endif /* !__ASSEMBLER__ */
|
|
|
|
#endif /* _ASM_NIOS2_PAGE_H */
|