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-rw-r--r--mm/memory.c29
1 files changed, 4 insertions, 25 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 622a4ef5409..51f7c0a220d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -809,8 +809,7 @@ unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
* Do a quick page-table lookup for a single page.
* mm->page_table_lock must be held.
*/
-static struct page *__follow_page(struct mm_struct *mm, unsigned long address,
- int read, int write, int accessed)
+struct page *follow_page(struct mm_struct *mm, unsigned long address, int write)
{
pgd_t *pgd;
pud_t *pud;
@@ -846,16 +845,12 @@ static struct page *__follow_page(struct mm_struct *mm, unsigned long address,
if (pte_present(pte)) {
if (write && !pte_write(pte))
goto out;
- if (read && !pte_read(pte))
- goto out;
pfn = pte_pfn(pte);
if (pfn_valid(pfn)) {
page = pfn_to_page(pfn);
- if (accessed) {
- if (write && !pte_dirty(pte) &&!PageDirty(page))
- set_page_dirty(page);
- mark_page_accessed(page);
- }
+ if (write && !pte_dirty(pte) &&!PageDirty(page))
+ set_page_dirty(page);
+ mark_page_accessed(page);
return page;
}
}
@@ -864,22 +859,6 @@ out:
return NULL;
}
-inline struct page *
-follow_page(struct mm_struct *mm, unsigned long address, int write)
-{
- return __follow_page(mm, address, 0, write, 1);
-}
-
-/*
- * check_user_page_readable() can be called frm niterrupt context by oprofile,
- * so we need to avoid taking any non-irq-safe locks
- */
-int check_user_page_readable(struct mm_struct *mm, unsigned long address)
-{
- return __follow_page(mm, address, 1, 0, 0) != NULL;
-}
-EXPORT_SYMBOL(check_user_page_readable);
-
static inline int
untouched_anonymous_page(struct mm_struct* mm, struct vm_area_struct *vma,
unsigned long address)