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-rw-r--r--mm/fremap.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/mm/fremap.c b/mm/fremap.c
index fd7f2a1..224cc15 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -29,19 +29,20 @@ static inline void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
return;
if (pte_present(pte)) {
unsigned long pfn = pte_pfn(pte);
+ struct page *page;
flush_cache_page(vma, addr, pfn);
pte = ptep_clear_flush(vma, addr, ptep);
- if (pfn_valid(pfn)) {
- struct page *page = pfn_to_page(pfn);
- if (!PageReserved(page)) {
- if (pte_dirty(pte))
- set_page_dirty(page);
- page_remove_rmap(page);
- page_cache_release(page);
- dec_mm_counter(mm, file_rss);
- }
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, pte, addr);
+ return;
}
+ page = pfn_to_page(pfn);
+ if (pte_dirty(pte))
+ set_page_dirty(page);
+ page_remove_rmap(page);
+ page_cache_release(page);
+ dec_mm_counter(mm, file_rss);
} else {
if (!pte_file(pte))
free_swap_and_cache(pte_to_swp_entry(pte));
@@ -65,6 +66,8 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
pgd_t *pgd;
pte_t pte_val;
+ BUG_ON(vma->vm_flags & VM_RESERVED);
+
pgd = pgd_offset(mm, addr);
spin_lock(&mm->page_table_lock);
@@ -125,6 +128,8 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
pgd_t *pgd;
pte_t pte_val;
+ BUG_ON(vma->vm_flags & VM_RESERVED);
+
pgd = pgd_offset(mm, addr);
spin_lock(&mm->page_table_lock);
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