diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/ksm.c | 12 | ||||
| -rw-r--r-- | mm/memory-failure.c | 5 | ||||
| -rw-r--r-- | mm/memory.c | 4 | ||||
| -rw-r--r-- | mm/mmap.c | 138 | ||||
| -rw-r--r-- | mm/mremap.c | 7 | ||||
| -rw-r--r-- | mm/nommu.c | 2 | ||||
| -rw-r--r-- | mm/rmap.c | 156 |
7 files changed, 248 insertions, 76 deletions
@@ -1563,10 +1563,12 @@ int page_referenced_ksm(struct page *page, struct mem_cgroup *memcg, again: hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) { struct anon_vma *anon_vma = rmap_item->anon_vma; + struct anon_vma_chain *vmac; struct vm_area_struct *vma; spin_lock(&anon_vma->lock); - list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) { + vma = vmac->vma; if (rmap_item->address < vma->vm_start || rmap_item->address >= vma->vm_end) continue; @@ -1614,10 +1616,12 @@ int try_to_unmap_ksm(struct page *page, enum ttu_flags flags) again: hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) { struct anon_vma *anon_vma = rmap_item->anon_vma; + struct anon_vma_chain *vmac; struct vm_area_struct *vma; spin_lock(&anon_vma->lock); - list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) { + vma = vmac->vma; if (rmap_item->address < vma->vm_start || rmap_item->address >= vma->vm_end) continue; @@ -1664,10 +1668,12 @@ int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *, again: hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) { struct anon_vma *anon_vma = rmap_item->anon_vma; + struct anon_vma_chain *vmac; struct vm_area_struct *vma; spin_lock(&anon_vma->lock); - list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) { + vma = vmac->vma; if (rmap_item->address < vma->vm_start || rmap_item->address >= vma->vm_end) continue; diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 17299fd4577c..d1f335162976 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -383,9 +383,12 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill, if (av == NULL) /* Not actually mapped anymore */ goto out; for_each_process (tsk) { + struct anon_vma_chain *vmac; + if (!task_early_kill(tsk)) continue; - list_for_each_entry (vma, &av->head, anon_vma_node) { + list_for_each_entry(vmac, &av->head, same_anon_vma) { + vma = vmac->vma; if (!page_mapped_in_vma(page, vma)) continue; if (vma->vm_mm == tsk->mm) diff --git a/mm/memory.c b/mm/memory.c index 77d9f840936b..dc785b438d70 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -374,7 +374,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma, * Hide vma from rmap and truncate_pagecache before freeing * pgtables */ - anon_vma_unlink(vma); + unlink_anon_vmas(vma); unlink_file_vma(vma); if (is_vm_hugetlb_page(vma)) { @@ -388,7 +388,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma, && !is_vm_hugetlb_page(next)) { vma = next; next = vma->vm_next; - anon_vma_unlink(vma); + unlink_anon_vmas(vma); unlink_file_vma(vma); } free_pgd_range(tlb, addr, vma->vm_end, diff --git a/mm/mmap.c b/mm/mmap.c index 31656147128e..6a0c15db7f60 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -437,7 +437,6 @@ __vma_link(struct mm_struct *mm, struct vm_area_struct *vma, { __vma_link_list(mm, vma, prev, rb_parent); __vma_link_rb(mm, vma, rb_link, rb_parent); - __anon_vma_link(vma); } static void vma_link(struct mm_struct *mm, struct vm_area_struct *vma, @@ -499,7 +498,7 @@ __vma_unlink(struct mm_struct *mm, struct vm_area_struct *vma, * are necessary. The "insert" vma (if any) is to be inserted * before we drop the necessary locks. */ -void vma_adjust(struct vm_area_struct *vma, unsigned long start, +int vma_adjust(struct vm_area_struct *vma, unsigned long start, unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) { struct mm_struct *mm = vma->vm_mm; @@ -542,6 +541,28 @@ again: remove_next = 1 + (end > next->vm_end); } } + /* + * When changing only vma->vm_end, we don't really need anon_vma lock. + */ + if (vma->anon_vma && (insert || importer || start != vma->vm_start)) + anon_vma = vma->anon_vma; + if (anon_vma) { + /* + * Easily overlooked: when mprotect shifts the boundary, + * make sure the expanding vma has anon_vma set if the + * shrinking vma had, to cover any anon pages imported. + */ + if (importer && !importer->anon_vma) { + /* Block reverse map lookups until things are set up. */ + importer->vm_flags |= VM_LOCK_RMAP; + if (anon_vma_clone(importer, vma)) { + importer->vm_flags &= ~VM_LOCK_RMAP; + return -ENOMEM; + } + importer->anon_vma = anon_vma; + } + } + if (file) { mapping = file->f_mapping; if (!(vma->vm_flags & VM_NONLINEAR)) @@ -567,25 +588,6 @@ again: remove_next = 1 + (end > next->vm_end); } } - /* - * When changing only vma->vm_end, we don't really need - * anon_vma lock. - */ - if (vma->anon_vma && (insert || importer || start != vma->vm_start)) - anon_vma = vma->anon_vma; - if (anon_vma) { - spin_lock(&anon_vma->lock); - /* - * Easily overlooked: when mprotect shifts the boundary, - * make sure the expanding vma has anon_vma set if the - * shrinking vma had, to cover any anon pages imported. - */ - if (importer && !importer->anon_vma) { - importer->anon_vma = anon_vma; - __anon_vma_link(importer); - } - } - if (root) { flush_dcache_mmap_lock(mapping); vma_prio_tree_remove(vma, root); @@ -616,8 +618,11 @@ again: remove_next = 1 + (end > next->vm_end); __vma_unlink(mm, next, vma); if (file) __remove_shared_vm_struct(next, file, mapping); - if (next->anon_vma) - __anon_vma_merge(vma, next); + /* + * This VMA is now dead, no need for rmap to follow it. + * Call anon_vma_merge below, outside of i_mmap_lock. + */ + next->vm_flags |= VM_LOCK_RMAP; } else if (insert) { /* * split_vma has split insert from vma, and needs @@ -627,17 +632,25 @@ again: remove_next = 1 + (end > next->vm_end); __insert_vm_struct(mm, insert); } - if (anon_vma) - spin_unlock(&anon_vma->lock); if (mapping) spin_unlock(&mapping->i_mmap_lock); + /* + * The current VMA has been set up. It is now safe for the + * rmap code to get from the pages to the ptes. + */ + if (anon_vma && importer) + importer->vm_flags &= ~VM_LOCK_RMAP; + if (remove_next) { if (file) { fput(file); if (next->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); } + /* Protected by mmap_sem and VM_LOCK_RMAP. */ + if (next->anon_vma) + anon_vma_merge(vma, next); mm->map_count--; mpol_put(vma_policy(next)); kmem_cache_free(vm_area_cachep, next); @@ -653,6 +666,8 @@ again: remove_next = 1 + (end > next->vm_end); } validate_mm(mm); + + return 0; } /* @@ -759,6 +774,7 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm, { pgoff_t pglen = (end - addr) >> PAGE_SHIFT; struct vm_area_struct *area, *next; + int err; /* * We later require that vma->vm_flags == vm_flags, @@ -792,11 +808,13 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm, is_mergeable_anon_vma(prev->anon_vma, next->anon_vma)) { /* cases 1, 6 */ - vma_adjust(prev, prev->vm_start, + err = vma_adjust(prev, prev->vm_start, next->vm_end, prev->vm_pgoff, NULL); } else /* cases 2, 5, 7 */ - vma_adjust(prev, prev->vm_start, + err = vma_adjust(prev, prev->vm_start, end, prev->vm_pgoff, NULL); + if (err) + return NULL; return prev; } @@ -808,11 +826,13 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm, can_vma_merge_before(next, vm_flags, anon_vma, file, pgoff+pglen)) { if (prev && addr < prev->vm_end) /* case 4 */ - vma_adjust(prev, prev->vm_start, + err = vma_adjust(prev, prev->vm_start, addr, prev->vm_pgoff, NULL); else /* cases 3, 8 */ - vma_adjust(area, addr, next->vm_end, + err = vma_adjust(area, addr, next->vm_end, next->vm_pgoff - pglen, NULL); + if (err) + return NULL; return area; } @@ -1205,6 +1225,7 @@ munmap_back: vma->vm_flags = vm_flags; vma->vm_page_prot = vm_get_page_prot(vm_flags); vma->vm_pgoff = pgoff; + INIT_LIST_HEAD(&vma->anon_vma_chain); if (file) { error = -EINVAL; @@ -1865,6 +1886,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, { struct mempolicy *pol; struct vm_area_struct *new; + int err = -ENOMEM; if (is_vm_hugetlb_page(vma) && (addr & ~(huge_page_mask(hstate_vma(vma))))) @@ -1872,11 +1894,13 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) - return -ENOMEM; + goto out_err; /* most fields are the same, copy all, and then fixup */ *new = *vma; + INIT_LIST_HEAD(&new->anon_vma_chain); + if (new_below) new->vm_end = addr; else { @@ -1886,11 +1910,14 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, pol = mpol_dup(vma_policy(vma)); if (IS_ERR(pol)) { - kmem_cache_free(vm_area_cachep, new); - return PTR_ERR(pol); + err = PTR_ERR(pol); + goto out_free_vma; } vma_set_policy(new, pol); + if (anon_vma_clone(new, vma)) + goto out_free_mpol; + if (new->vm_file) { get_file(new->vm_file); if (vma->vm_flags & VM_EXECUTABLE) @@ -1901,12 +1928,28 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, new->vm_ops->open(new); if (new_below) - vma_adjust(vma, addr, vma->vm_end, vma->vm_pgoff + + err = vma_adjust(vma, addr, vma->vm_end, vma->vm_pgoff + ((addr - new->vm_start) >> PAGE_SHIFT), new); else - vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new); + err = vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new); - return 0; + /* Success. */ + if (!err) + return 0; + + /* Clean everything up if vma_adjust failed. */ + new->vm_ops->close(new); + if (new->vm_file) { + if (vma->vm_flags & VM_EXECUTABLE) + removed_exe_file_vma(mm); + fput(new->vm_file); + } + out_free_mpol: + mpol_put(pol); + out_free_vma: + kmem_cache_free(vm_area_cachep, new); + out_err: + return err; } /* @@ -2116,6 +2159,7 @@ unsigned long do_brk(unsigned long addr, unsigned long len) return -ENOMEM; } + INIT_LIST_HEAD(&vma->anon_vma_chain); vma->vm_mm = mm; vma->vm_start = addr; vma->vm_end = addr + len; @@ -2252,10 +2296,11 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, if (new_vma) { *new_vma = *vma; pol = mpol_dup(vma_policy(vma)); - if (IS_ERR(pol)) { - kmem_cache_free(vm_area_cachep, new_vma); - return NULL; - } + if (IS_ERR(pol)) + goto out_free_vma; + INIT_LIST_HEAD(&new_vma->anon_vma_chain); + if (anon_vma_clone(new_vma, vma)) + goto out_free_mempol; vma_set_policy(new_vma, pol); new_vma->vm_start = addr; new_vma->vm_end = addr + len; @@ -2271,6 +2316,12 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, } } return new_vma; + + out_free_mempol: + mpol_put(pol); + out_free_vma: + kmem_cache_free(vm_area_cachep, new_vma); + return NULL; } /* @@ -2348,6 +2399,7 @@ int install_special_mapping(struct mm_struct *mm, if (unlikely(vma == NULL)) return -ENOMEM; + INIT_LIST_HEAD(&vma->anon_vma_chain); vma->vm_mm = mm; vma->vm_start = addr; vma->vm_end = addr + len; @@ -2448,6 +2500,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping) int mm_take_all_locks(struct mm_struct *mm) { struct vm_area_struct *vma; + struct anon_vma_chain *avc; int ret = -EINTR; BUG_ON(down_read_trylock(&mm->mmap_sem)); @@ -2465,7 +2518,8 @@ int mm_take_all_locks(struct mm_struct *mm) if (signal_pending(current)) goto out_unlock; if (vma->anon_vma) - vm_lock_anon_vma(mm, vma->anon_vma); + list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) + vm_lock_anon_vma(mm, avc->anon_vma); } ret = 0; @@ -2520,13 +2574,15 @@ static void vm_unlock_mapping(struct address_space *mapping) void mm_drop_all_locks(struct mm_struct *mm) { struct vm_area_struct *vma; + struct anon_vma_chain *avc; BUG_ON(down_read_trylock(&mm->mmap_sem)); BUG_ON(!mutex_is_locked(&mm_all_locks_mutex)); for (vma = mm->mmap; vma; vma = vma->vm_next) { if (vma->anon_vma) - vm_unlock_anon_vma(vma->anon_vma); + list_for_each_entry(avc, &vma->anon_vma_chain, same_vma) + vm_unlock_anon_vma(avc->anon_vma); if (vma->vm_file && vma->vm_file->f_mapping) vm_unlock_mapping(vma->vm_file->f_mapping); } diff --git a/mm/mremap.c b/mm/mremap.c index 4c4c803453f3..e9c75efce609 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -460,8 +460,11 @@ unsigned long do_mremap(unsigned long addr, if (vma_expandable(vma, new_len - old_len)) { int pages = (new_len - old_len) >> PAGE_SHIFT; - vma_adjust(vma, vma->vm_start, - addr + new_len, vma->vm_pgoff, NULL); + if (vma_adjust(vma, vma->vm_start, addr + new_len, + vma->vm_pgoff, NULL)) { + ret = -ENOMEM; + goto out; + } mm->total_vm += pages; vm_stat_account(mm, vma->vm_flags, vma->vm_file, pages); diff --git a/mm/nommu.c b/mm/nommu.c index 48a2ecfaf059..55727a74af98 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1209,7 +1209,7 @@ unsigned long do_mmap_pgoff(struct file *file, region->vm_flags = vm_flags; region->vm_pgoff = pgoff; - INIT_LIST_HEAD(&vma->anon_vma_node); + INIT_LIST_HEAD(&vma->anon_vma_chain); vma->vm_flags = vm_flags; vma->vm_pgoff = pgoff; diff --git a/mm/rmap.c b/mm/rmap.c index 5cb47111f79e..be34094e4595 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -62,6 +62,7 @@ #include "internal.h" static struct kmem_cache *anon_vma_cachep; +static struct kmem_cache *anon_vma_chain_cachep; static inline struct anon_vma *anon_vma_alloc(void) { @@ -73,6 +74,16 @@ void anon_vma_free(struct anon_vma *anon_vma) kmem_cache_free(anon_vma_cachep, anon_vma); } +static inline struct anon_vma_chain *anon_vma_chain_alloc(void) +{ + return kmem_cache_alloc(anon_vma_chain_cachep, GFP_KERNEL); +} + +void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain) +{ + kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain); +} + /** * anon_vma_prepare - attach an anon_vma to a memory region * @vma: the memory region in question @@ -103,18 +114,23 @@ void anon_vma_free(struct anon_vma *anon_vma) int anon_vma_prepare(struct vm_area_struct *vma) { struct anon_vma *anon_vma = vma->anon_vma; + struct anon_vma_chain *avc; might_sleep(); if (unlikely(!anon_vma)) { struct mm_struct *mm = vma->vm_mm; struct anon_vma *allocated; + avc = anon_vma_chain_alloc(); + if (!avc) + goto out_enomem; + anon_vma = find_mergeable_anon_vma(vma); allocated = NULL; if (!anon_vma) { anon_vma = anon_vma_alloc(); if (unlikely(!anon_vma)) - return -ENOMEM; + goto out_enomem_free_avc; allocated = anon_vma; } spin_lock(&anon_vma->lock); @@ -123,53 +139,113 @@ int anon_vma_prepare(struct vm_area_struct *vma) spin_lock(&mm->page_table_lock); if (likely(!vma->anon_vma)) { vma->anon_vma = anon_vma; - list_add_tail(&vma->anon_vma_node, &anon_vma->head); + avc->anon_vma = anon_vma; + avc->vma = vma; + list_add(&avc->same_vma, &vma->anon_vma_chain); + list_add(&avc->same_anon_vma, &anon_vma->head); allocated = NULL; } spin_unlock(&mm->page_table_lock); spin_unlock(&anon_vma->lock); - if (unlikely(allocated)) + if (unlikely(allocated)) { anon_vma_free(allocated); + anon_vma_chain_free(avc); + } } return 0; + + out_enomem_free_avc: + anon_vma_chain_free(avc); + out_enomem: + return -ENOMEM; } -void __anon_vma_merge(struct vm_area_struct *vma, struct vm_area_struct *next) +static void anon_vma_chain_link(struct vm_area_struct *vma, + struct anon_vma_chain *avc, + struct anon_vma *anon_vma) { - BUG_ON(vma->anon_vma != next->anon_vma); - list_del(&next->anon_vma_node); + avc->vma = vma; + avc->anon_vma = anon_vma; + list_add(&avc->same_vma, &vma->anon_vma_chain); + + spin_lock(&anon_vma->lock); + list_add_tail(&avc->same_anon_vma, &anon_vma->head); + spin_unlock(&anon_vma->lock); } -void __anon_vma_link(struct vm_area_struct *vma) +/* + * Attach the anon_vmas from src to dst. + * Returns 0 on success, -ENOMEM on failure. + */ +int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src) { - struct anon_vma *anon_vma = vma->anon_vma; + struct anon_vma_chain *avc, *pavc; + + list_for_each_entry(pavc, &src->anon_vma_chain, same_vma) { + avc = anon_vma_chain_alloc(); + if (!avc) + goto enomem_failure; + anon_vma_chain_link(dst, avc, pavc->anon_vma); + } + return 0; - if (anon_vma) - list_add_tail(&vma->anon_vma_node, &anon_vma->head); + enomem_failure: + unlink_anon_vmas(dst); + return -ENOMEM; } -void anon_vma_link(struct vm_area_struct *vma) +/* + * Attach vma to its own anon_vma, as well as to the anon_vmas that + * the corresponding VMA in the parent process is attached to. + * Returns 0 on success, non-zero on failure. + */ +int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma) { - struct anon_vma *anon_vma = vma->anon_vma; + struct anon_vma_chain *avc; + struct anon_vma *anon_vma; - if (anon_vma) { - spin_lock(&anon_vma->lock); - list_add_tail(&vma->anon_vma_node, &anon_vma->head); - spin_unlock(&anon_vma->lock); - } + /* Don't bother if the parent process has no anon_vma here. */ + if (!pvma->anon_vma) + return 0; + + /* + * First, attach the new VMA to the parent VMA's anon_vmas, + * so rmap can find non-COWed pages in child processes. + */ + if (anon_vma_clone(vma, pvma)) + return -ENOMEM; + + /* Then add our own anon_vma. */ + anon_vma = anon_vma_alloc(); + if (!anon_vma) + goto out_error; + avc = anon_vma_chain_alloc(); + if (!avc) + goto out_error_free_anon_vma; + anon_vma_chain_link(vma, avc, anon_vma); + /* Mark this anon_vma as the one where our new (COWed) pages go. */ + vma->anon_vma = anon_vma; + + return 0; + + out_error_free_anon_vma: + anon_vma_free(anon_vma); + out_error: + return -ENOMEM; } -void anon_vma_unlink(struct vm_area_struct *vma) +static void anon_vma_unlink(struct anon_vma_chain *anon_vma_chain) { - struct anon_vma *anon_vma = vma->anon_vma; + struct anon_vma *anon_vma = anon_vma_chain->anon_vma; int empty; + /* If anon_vma_fork fails, we can get an empty anon_vma_chain. */ if (!anon_vma) return; spin_lock(&anon_vma->lock); - list_del(&vma->anon_vma_node); + list_del(&anon_vma_chain->same_anon_vma); /* We must garbage collect the anon_vma if it's empty */ empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma); @@ -179,6 +255,18 @@ void anon_vma_unlink(struct vm_area_struct *vma) anon_vma_free(anon_vma); } +void unlink_anon_vmas(struct vm_area_struct *vma) +{ + struct anon_vma_chain *avc, *next; + + /* Unlink each anon_vma chained to the VMA. */ + list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) { + anon_vma_unlink(avc); + list_del(&avc->same_vma); + anon_vma_chain_free(avc); + } +} + static void anon_vma_ctor(void *data) { struct anon_vma *anon_vma = data; @@ -192,6 +280,7 @@ void __init anon_vma_init(void) { anon_vma_cachep = kmem_cache_create("anon_vma", sizeof(struct anon_vma), 0, SLAB_DESTROY_BY_RCU|SLAB_PANIC, anon_vma_ctor); + anon_vma_chain_cachep = KMEM_CACHE(anon_vma_chain, SLAB_PANIC); } /* @@ -240,6 +329,18 @@ vma_address(struct page *page, struct vm_area_struct *vma) /* page should be within @vma mapping range */ return -EFAULT; } + if (unlikely(vma->vm_flags & VM_LOCK_RMAP)) { + /* + * This VMA is being unlinked or is not yet linked into the + * VMA tree. Do not try to follow this rmap. This race + * condition can result in page_referenced() ignoring a + * reference or in try_to_unmap() failing to unmap a page. + * The VMA cannot be freed under us because we hold the + * anon_vma->lock, which the munmap code takes while + * unlinking the anon_vmas from the VMA. + */ + return -EFAULT; + } return address; } @@ -396,7 +497,7 @@ static int page_referenced_anon(struct page *page, { unsigned int mapcount; struct anon_vma *anon_vma; - struct vm_area_struct *vma; + struct anon_vma_chain *avc; int referenced = 0; anon_vma = page_lock_anon_vma(page); @@ -404,7 +505,8 @@ static int page_referenced_anon(struct page *page, return referenced; mapcount = page_mapcount(page); - list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + list_for_each_entry(avc, &anon_vma->head, same_anon_vma) { + struct vm_area_struct *vma = avc->vma; unsigned long address = vma_address(page, vma); if (address == -EFAULT) continue; @@ -1025,14 +1127,15 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, static int try_to_unmap_anon(struct page *page, enum ttu_flags flags) { struct anon_vma *anon_vma; - struct vm_area_struct *vma; + struct anon_vma_chain *avc; int ret = SWAP_AGAIN; anon_vma = page_lock_anon_vma(page); if (!anon_vma) return ret; - list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + list_for_each_entry(avc, &anon_vma->head, same_anon_vma) { + struct vm_area_struct *vma = avc->vma; unsigned long address = vma_address(page, vma); if (address == -EFAULT) continue; @@ -1223,7 +1326,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *, struct vm_area_struct *, unsigned long, void *), void *arg) { struct anon_vma *anon_vma; - struct vm_area_struct *vma; + struct anon_vma_chain *avc; int ret = SWAP_AGAIN; /* @@ -1238,7 +1341,8 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *, if (!anon_vma) return ret; spin_lock(&anon_vma->lock); - list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + list_for_each_entry(avc, &anon_vma->head, same_anon_vma) { + struct vm_area_struct *vma = avc->vma; unsigned long address = vma_address(page, vma); if (address == -EFAULT) continue; |