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https://gitee.com/bianbu-linux/linux-6.6
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c5f756d8c6
32-bit PAGE_MASK can not be used as a mask for physical addresses when PAE is enabled. PAGE_MASK_PHYS must be used for physical addresses instead of PAGE_MASK. Without this, init gets SIGSEGV if pte_modify was called: | potentially unexpected fatal signal 11. | Path: /bin/busybox | CPU: 0 PID: 1 Comm: init Not tainted 5.12.0-rc5-00003-g1e43c377a79f-dirty | Insn could not be fetched | @No matching VMA found | ECR: 0x00040000 EFA: 0x00000000 ERET: 0x00000000 | STAT: 0x80080082 [IE U ] BTA: 0x00000000 | SP: 0x5f9ffe44 FP: 0x00000000 BLK: 0xaf3d4 | LPS: 0x000d093e LPE: 0x000d0950 LPC: 0x00000000 | r00: 0x00000002 r01: 0x5f9fff14 r02: 0x5f9fff20 | ... | Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Signed-off-by: Vladimir Isaev <isaev@synopsys.com> Reported-by: kernel test robot <lkp@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: stable@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*/
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#ifndef __ASM_ARC_PAGE_H
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#define __ASM_ARC_PAGE_H
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#include <uapi/asm/page.h>
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#ifdef CONFIG_ARC_HAS_PAE40
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#define MAX_POSSIBLE_PHYSMEM_BITS 40
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#define PAGE_MASK_PHYS (0xff00000000ull | PAGE_MASK)
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#else /* CONFIG_ARC_HAS_PAE40 */
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#define MAX_POSSIBLE_PHYSMEM_BITS 32
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#define PAGE_MASK_PHYS PAGE_MASK
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#endif /* CONFIG_ARC_HAS_PAE40 */
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#ifndef __ASSEMBLY__
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#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
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struct vm_area_struct;
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struct page;
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#define __HAVE_ARCH_COPY_USER_HIGHPAGE
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long u_vaddr, struct vm_area_struct *vma);
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void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
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#undef STRICT_MM_TYPECHECKS
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#ifdef STRICT_MM_TYPECHECKS
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct {
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#ifdef CONFIG_ARC_HAS_PAE40
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unsigned long long pte;
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#else
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unsigned long pte;
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#endif
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} pte_t;
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typedef struct {
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unsigned long pgd;
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} pgd_t;
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typedef struct {
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unsigned long pgprot;
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} pgprot_t;
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#define pte_val(x) ((x).pte)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) })
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#define __pgd(x) ((pgd_t) { (x) })
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#define __pgprot(x) ((pgprot_t) { (x) })
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#define pte_pgprot(x) __pgprot(pte_val(x))
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#else /* !STRICT_MM_TYPECHECKS */
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#ifdef CONFIG_ARC_HAS_PAE40
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typedef unsigned long long pte_t;
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#else
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typedef unsigned long pte_t;
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#endif
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typedef unsigned long pgd_t;
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typedef unsigned long pgprot_t;
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#define pte_val(x) (x)
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#define pgd_val(x) (x)
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#define pgprot_val(x) (x)
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#define __pte(x) (x)
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#define __pgd(x) (x)
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#define __pgprot(x) (x)
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#define pte_pgprot(x) (x)
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#endif
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typedef pte_t * pgtable_t;
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/*
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* Use virt_to_pfn with caution:
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* If used in pte or paddr related macros, it could cause truncation
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* in PAE40 builds
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* As a rule of thumb, only use it in helpers starting with virt_
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* You have been warned !
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*/
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#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
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/*
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* When HIGHMEM is enabled we have holes in the memory map so we need
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* pfn_valid() that takes into account the actual extents of the physical
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* memory
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*/
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#ifdef CONFIG_HIGHMEM
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extern unsigned long arch_pfn_offset;
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#define ARCH_PFN_OFFSET arch_pfn_offset
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extern int pfn_valid(unsigned long pfn);
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#define pfn_valid pfn_valid
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#else /* CONFIG_HIGHMEM */
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#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
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#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
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#endif /* CONFIG_HIGHMEM */
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/*
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* __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
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*
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* These macros have historically been misnamed
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* virt here means link-address/program-address as embedded in object code.
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* And for ARC, link-addr = physical address
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*/
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#define __pa(vaddr) ((unsigned long)(vaddr))
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#define __va(paddr) ((void *)((unsigned long)(paddr)))
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#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
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#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
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/* Default Permissions for stack/heaps pages (Non Executable) */
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#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
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#define WANT_PAGE_VIRTUAL 1
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#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
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#include <asm-generic/getorder.h>
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#endif /* !__ASSEMBLY__ */
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#endif
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