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-rw-r--r--mm/memory.c95
1 files changed, 67 insertions, 28 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 098f00d05461..305537fc8640 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -789,6 +789,46 @@ out:
return pfn_to_page(pfn);
}
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
+ pmd_t pmd)
+{
+ unsigned long pfn = pmd_pfn(pmd);
+
+ /*
+ * There is no pmd_special() but there may be special pmds, e.g.
+ * in a direct-access (dax) mapping, so let's just replicate the
+ * !HAVE_PTE_SPECIAL case from vm_normal_page() here.
+ */
+ if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
+ if (vma->vm_flags & VM_MIXEDMAP) {
+ if (!pfn_valid(pfn))
+ return NULL;
+ goto out;
+ } else {
+ unsigned long off;
+ off = (addr - vma->vm_start) >> PAGE_SHIFT;
+ if (pfn == vma->vm_pgoff + off)
+ return NULL;
+ if (!is_cow_mapping(vma->vm_flags))
+ return NULL;
+ }
+ }
+
+ if (is_zero_pfn(pfn))
+ return NULL;
+ if (unlikely(pfn > highest_memmap_pfn))
+ return NULL;
+
+ /*
+ * NOTE! We still have PageReserved() pages in the page tables.
+ * eg. VDSO mappings can cause them to exist.
+ */
+out:
+ return pfn_to_page(pfn);
+}
+#endif
+
/*
* copy one vm_area from one task to the other. Assumes the page tables
* already present in the new task to be cleared in the whole range
@@ -2054,7 +2094,7 @@ static inline int wp_page_reuse(struct mm_struct *mm,
VM_BUG_ON_PAGE(PageAnon(page), page);
mapping = page->mapping;
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
if ((dirtied || page_mkwrite) && mapping) {
/*
@@ -2188,7 +2228,7 @@ static int wp_page_copy(struct mm_struct *mm, struct vm_area_struct *vma,
}
if (new_page)
- page_cache_release(new_page);
+ put_page(new_page);
pte_unmap_unlock(page_table, ptl);
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
@@ -2203,14 +2243,14 @@ static int wp_page_copy(struct mm_struct *mm, struct vm_area_struct *vma,
munlock_vma_page(old_page);
unlock_page(old_page);
}
- page_cache_release(old_page);
+ put_page(old_page);
}
return page_copied ? VM_FAULT_WRITE : 0;
oom_free_new:
- page_cache_release(new_page);
+ put_page(new_page);
oom:
if (old_page)
- page_cache_release(old_page);
+ put_page(old_page);
return VM_FAULT_OOM;
}
@@ -2258,7 +2298,7 @@ static int wp_page_shared(struct mm_struct *mm, struct vm_area_struct *vma,
{
int page_mkwrite = 0;
- page_cache_get(old_page);
+ get_page(old_page);
if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
int tmp;
@@ -2267,7 +2307,7 @@ static int wp_page_shared(struct mm_struct *mm, struct vm_area_struct *vma,
tmp = do_page_mkwrite(vma, old_page, address);
if (unlikely(!tmp || (tmp &
(VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
- page_cache_release(old_page);
+ put_page(old_page);
return tmp;
}
/*
@@ -2281,7 +2321,7 @@ static int wp_page_shared(struct mm_struct *mm, struct vm_area_struct *vma,
if (!pte_same(*page_table, orig_pte)) {
unlock_page(old_page);
pte_unmap_unlock(page_table, ptl);
- page_cache_release(old_page);
+ put_page(old_page);
return 0;
}
page_mkwrite = 1;
@@ -2341,7 +2381,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
*/
if (PageAnon(old_page) && !PageKsm(old_page)) {
if (!trylock_page(old_page)) {
- page_cache_get(old_page);
+ get_page(old_page);
pte_unmap_unlock(page_table, ptl);
lock_page(old_page);
page_table = pte_offset_map_lock(mm, pmd, address,
@@ -2349,10 +2389,10 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (!pte_same(*page_table, orig_pte)) {
unlock_page(old_page);
pte_unmap_unlock(page_table, ptl);
- page_cache_release(old_page);
+ put_page(old_page);
return 0;
}
- page_cache_release(old_page);
+ put_page(old_page);
}
if (reuse_swap_page(old_page)) {
/*
@@ -2375,7 +2415,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
/*
* Ok, we need to copy. Oh, well..
*/
- page_cache_get(old_page);
+ get_page(old_page);
pte_unmap_unlock(page_table, ptl);
return wp_page_copy(mm, vma, address, page_table, pmd,
@@ -2400,7 +2440,6 @@ static inline void unmap_mapping_range_tree(struct rb_root *root,
vba = vma->vm_pgoff;
vea = vba + vma_pages(vma) - 1;
- /* Assume for now that PAGE_CACHE_SHIFT == PAGE_SHIFT */
zba = details->first_index;
if (zba < vba)
zba = vba;
@@ -2619,7 +2658,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
* parallel locked swapcache.
*/
unlock_page(swapcache);
- page_cache_release(swapcache);
+ put_page(swapcache);
}
if (flags & FAULT_FLAG_WRITE) {
@@ -2641,10 +2680,10 @@ out_nomap:
out_page:
unlock_page(page);
out_release:
- page_cache_release(page);
+ put_page(page);
if (page != swapcache) {
unlock_page(swapcache);
- page_cache_release(swapcache);
+ put_page(swapcache);
}
return ret;
}
@@ -2752,7 +2791,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (userfaultfd_missing(vma)) {
pte_unmap_unlock(page_table, ptl);
mem_cgroup_cancel_charge(page, memcg, false);
- page_cache_release(page);
+ put_page(page);
return handle_userfault(vma, address, flags,
VM_UFFD_MISSING);
}
@@ -2771,10 +2810,10 @@ unlock:
return 0;
release:
mem_cgroup_cancel_charge(page, memcg, false);
- page_cache_release(page);
+ put_page(page);
goto unlock;
oom_free_page:
- page_cache_release(page);
+ put_page(page);
oom:
return VM_FAULT_OOM;
}
@@ -2807,7 +2846,7 @@ static int __do_fault(struct vm_area_struct *vma, unsigned long address,
if (unlikely(PageHWPoison(vmf.page))) {
if (ret & VM_FAULT_LOCKED)
unlock_page(vmf.page);
- page_cache_release(vmf.page);
+ put_page(vmf.page);
return VM_FAULT_HWPOISON;
}
@@ -2996,7 +3035,7 @@ static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (unlikely(!pte_same(*pte, orig_pte))) {
pte_unmap_unlock(pte, ptl);
unlock_page(fault_page);
- page_cache_release(fault_page);
+ put_page(fault_page);
return ret;
}
do_set_pte(vma, address, fault_page, pte, false, false);
@@ -3024,7 +3063,7 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return VM_FAULT_OOM;
if (mem_cgroup_try_charge(new_page, mm, GFP_KERNEL, &memcg, false)) {
- page_cache_release(new_page);
+ put_page(new_page);
return VM_FAULT_OOM;
}
@@ -3041,7 +3080,7 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
pte_unmap_unlock(pte, ptl);
if (fault_page) {
unlock_page(fault_page);
- page_cache_release(fault_page);
+ put_page(fault_page);
} else {
/*
* The fault handler has no page to lock, so it holds
@@ -3057,7 +3096,7 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
pte_unmap_unlock(pte, ptl);
if (fault_page) {
unlock_page(fault_page);
- page_cache_release(fault_page);
+ put_page(fault_page);
} else {
/*
* The fault handler has no page to lock, so it holds
@@ -3068,7 +3107,7 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return ret;
uncharge_out:
mem_cgroup_cancel_charge(new_page, memcg, false);
- page_cache_release(new_page);
+ put_page(new_page);
return ret;
}
@@ -3096,7 +3135,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
tmp = do_page_mkwrite(vma, fault_page, address);
if (unlikely(!tmp ||
(tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
- page_cache_release(fault_page);
+ put_page(fault_page);
return tmp;
}
}
@@ -3105,7 +3144,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (unlikely(!pte_same(*pte, orig_pte))) {
pte_unmap_unlock(pte, ptl);
unlock_page(fault_page);
- page_cache_release(fault_page);
+ put_page(fault_page);
return ret;
}
do_set_pte(vma, address, fault_page, pte, true, false);
@@ -3736,7 +3775,7 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
buf, maddr + offset, bytes);
}
kunmap(page);
- page_cache_release(page);
+ put_page(page);
}
len -= bytes;
buf += bytes;
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 08:02:21 +0000