diff options
Diffstat (limited to 'mm/filemap_xip.c')
| -rw-r--r-- | mm/filemap_xip.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c index 4553b2c5aab4..8c199f537732 100644 --- a/mm/filemap_xip.c +++ b/mm/filemap_xip.c @@ -68,13 +68,12 @@ do_xip_mapping_read(struct address_space *mapping, if (unlikely(IS_ERR(page))) { if (PTR_ERR(page) == -ENODATA) { /* sparse */ - page = virt_to_page(empty_zero_page); + page = ZERO_PAGE(0); } else { desc->error = PTR_ERR(page); goto out; } - } else - BUG_ON(!PageUptodate(page)); + } /* If users can be writing to this page using arbitrary * virtual addresses, take care about potential aliasing @@ -84,8 +83,7 @@ do_xip_mapping_read(struct address_space *mapping, flush_dcache_page(page); /* - * Ok, we have the page, and it's up-to-date, so - * now we can copy it to user space... + * Ok, we have the page, so now we can copy it to user space... * * The actor routine returns how many bytes were actually used.. * NOTE! This may not be the same as how much of a user buffer @@ -164,7 +162,7 @@ EXPORT_SYMBOL_GPL(xip_file_sendfile); * xip_write * * This function walks all vmas of the address_space and unmaps the - * empty_zero_page when found at pgoff. Should it go in rmap.c? + * ZERO_PAGE when found at pgoff. Should it go in rmap.c? */ static void __xip_unmap (struct address_space * mapping, @@ -187,7 +185,7 @@ __xip_unmap (struct address_space * mapping, * We need the page_table_lock to protect us from page faults, * munmap, fork, etc... */ - pte = page_check_address(virt_to_page(empty_zero_page), mm, + pte = page_check_address(ZERO_PAGE(address), mm, address); if (!IS_ERR(pte)) { /* Nuke the page table entry. */ @@ -230,7 +228,6 @@ xip_file_nopage(struct vm_area_struct * area, page = mapping->a_ops->get_xip_page(mapping, pgoff*(PAGE_SIZE/512), 0); if (!IS_ERR(page)) { - BUG_ON(!PageUptodate(page)); return page; } if (PTR_ERR(page) != -ENODATA) @@ -245,12 +242,11 @@ xip_file_nopage(struct vm_area_struct * area, pgoff*(PAGE_SIZE/512), 1); if (IS_ERR(page)) return NULL; - BUG_ON(!PageUptodate(page)); /* unmap page at pgoff from all other vmas */ __xip_unmap(mapping, pgoff); } else { - /* not shared and writable, use empty_zero_page */ - page = virt_to_page(empty_zero_page); + /* not shared and writable, use ZERO_PAGE() */ + page = ZERO_PAGE(address); } return page; @@ -319,8 +315,6 @@ __xip_file_write(struct file *filp, const char __user *buf, break; } - BUG_ON(!PageUptodate(page)); - copied = filemap_copy_from_user(page, offset, buf, bytes); flush_dcache_page(page); if (likely(copied > 0)) { @@ -435,8 +429,7 @@ xip_truncate_page(struct address_space *mapping, loff_t from) return 0; else return PTR_ERR(page); - } else - BUG_ON(!PageUptodate(page)); + } kaddr = kmap_atomic(page, KM_USER0); memset(kaddr + offset, 0, length); kunmap_atomic(kaddr, KM_USER0); |