diff options
Diffstat (limited to 'mm/vma.h')
| -rw-r--r-- | mm/vma.h | 73 |
1 files changed, 68 insertions, 5 deletions
@@ -155,6 +155,72 @@ struct vma_merge_struct { }; +struct unmap_desc { + struct ma_state *mas; /* the maple state point to the first vma */ + struct vm_area_struct *first; /* The first vma */ + unsigned long pg_start; /* The first pagetable address to free (floor) */ + unsigned long pg_end; /* The last pagetable address to free (ceiling) */ + unsigned long vma_start; /* The min vma address */ + unsigned long vma_end; /* The max vma address */ + unsigned long tree_end; /* Maximum for the vma tree search */ + unsigned long tree_reset; /* Where to reset the vma tree walk */ + bool mm_wr_locked; /* If the mmap write lock is held */ +}; + +/* + * unmap_all_init() - Initialize unmap_desc to remove all vmas, point the + * pg_start and pg_end to a safe location. + */ +static inline void unmap_all_init(struct unmap_desc *unmap, + struct vma_iterator *vmi, struct vm_area_struct *vma) +{ + unmap->mas = &vmi->mas; + unmap->first = vma; + unmap->pg_start = FIRST_USER_ADDRESS; + unmap->pg_end = USER_PGTABLES_CEILING; + unmap->vma_start = 0; + unmap->vma_end = ULONG_MAX; + unmap->tree_end = ULONG_MAX; + unmap->tree_reset = vma->vm_end; + unmap->mm_wr_locked = false; +} + +/* + * unmap_pgtable_init() - Initialize unmap_desc to remove all page tables within + * the user range. + * + * ARM can have mappings outside of vmas. + * See: e2cdef8c847b4 ("[PATCH] freepgt: free_pgtables from FIRST_USER_ADDRESS") + * + * ARM LPAE uses page table mappings beyond the USER_PGTABLES_CEILING + * See: CONFIG_ARM_LPAE in arch/arm/include/asm/pgtable.h + */ +static inline void unmap_pgtable_init(struct unmap_desc *unmap, + struct vma_iterator *vmi) +{ + vma_iter_set(vmi, unmap->tree_reset); + unmap->vma_start = FIRST_USER_ADDRESS; + unmap->vma_end = USER_PGTABLES_CEILING; + unmap->tree_end = USER_PGTABLES_CEILING; +} + +#define UNMAP_STATE(name, _vmi, _vma, _vma_start, _vma_end, _prev, _next) \ + struct unmap_desc name = { \ + .mas = &(_vmi)->mas, \ + .first = _vma, \ + .pg_start = _prev ? ((struct vm_area_struct *)_prev)->vm_end : \ + FIRST_USER_ADDRESS, \ + .pg_end = _next ? ((struct vm_area_struct *)_next)->vm_start : \ + USER_PGTABLES_CEILING, \ + .vma_start = _vma_start, \ + .vma_end = _vma_end, \ + .tree_end = _next ? \ + ((struct vm_area_struct *)_next)->vm_start : \ + USER_PGTABLES_CEILING, \ + .tree_reset = _vma->vm_end, \ + .mm_wr_locked = true, \ + } + static inline bool vmg_nomem(struct vma_merge_struct *vmg) { return vmg->state == VMA_MERGE_ERROR_NOMEM; @@ -243,8 +309,7 @@ static inline void set_vma_from_desc(struct vm_area_struct *vma, vma->vm_pgoff = desc->pgoff; if (desc->vm_file != vma->vm_file) vma_set_file(vma, desc->vm_file); - if (desc->vm_flags != vma->vm_flags) - vm_flags_set(vma, desc->vm_flags); + vma->flags = desc->vma_flags; vma->vm_page_prot = desc->page_prot; /* User-defined fields. */ @@ -262,9 +327,7 @@ int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm, bool unlock); void remove_vma(struct vm_area_struct *vma); - -void unmap_region(struct ma_state *mas, struct vm_area_struct *vma, - struct vm_area_struct *prev, struct vm_area_struct *next); +void unmap_region(struct unmap_desc *unmap); /** * vma_modify_flags() - Perform any necessary split/merge in preparation for |