manual update from upstream:

Applied Al's change 06a544971fad0992fe8b92c5647538d573089dd4
to new location of swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index b5346576e58..5d6e4c2000d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -66,7 +66,7 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *
  *  ->mmap_sem
  *    ->i_mmap_lock
- *      ->page_table_lock	(various places, mainly in mmap.c)
+ *      ->page_table_lock or pte_lock	(various, mainly in memory.c)
  *        ->mapping->tree_lock	(arch-dependent flush_dcache_mmap_lock)
  *
  *  ->mmap_sem
@@ -86,9 +86,9 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *    ->anon_vma.lock		(vma_adjust)
  *
  *  ->anon_vma.lock
- *    ->page_table_lock		(anon_vma_prepare and various)
+ *    ->page_table_lock or pte_lock	(anon_vma_prepare and various)
  *
- *  ->page_table_lock
+ *  ->page_table_lock or pte_lock
  *    ->swap_lock		(try_to_unmap_one)
  *    ->private_lock		(try_to_unmap_one)
  *    ->tree_lock		(try_to_unmap_one)
@@ -152,7 +152,7 @@ static int sync_page(void *word)
 	 * in the ->sync_page() methods make essential use of the
 	 * page_mapping(), merely passing the page down to the backing
 	 * device's unplug functions when it's non-NULL, which in turn
-	 * ignore it for all cases but swap, where only page->private is
+	 * ignore it for all cases but swap, where only page_private(page) is
 	 * of interest. When page_mapping() does go NULL, the entire
 	 * call stack gracefully ignores the page and returns.
 	 * -- wli
@@ -377,7 +377,7 @@ int filemap_write_and_wait_range(struct address_space *mapping,
  * This function does not add the page to the LRU.  The caller must do that.
  */
 int add_to_page_cache(struct page *page, struct address_space *mapping,
-		pgoff_t offset, int gfp_mask)
+		pgoff_t offset, gfp_t gfp_mask)
 {
 	int error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
 
@@ -401,7 +401,7 @@ int add_to_page_cache(struct page *page, struct address_space *mapping,
 EXPORT_SYMBOL(add_to_page_cache);
 
 int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
-				pgoff_t offset, int gfp_mask)
+				pgoff_t offset, gfp_t gfp_mask)
 {
 	int ret = add_to_page_cache(page, mapping, offset, gfp_mask);
 	if (ret == 0)
@@ -591,7 +591,7 @@ EXPORT_SYMBOL(find_lock_page);
  * memory exhaustion.
  */
 struct page *find_or_create_page(struct address_space *mapping,
-		unsigned long index, unsigned int gfp_mask)
+		unsigned long index, gfp_t gfp_mask)
 {
 	struct page *page, *cached_page = NULL;
 	int err;
@@ -683,7 +683,7 @@ struct page *
 grab_cache_page_nowait(struct address_space *mapping, unsigned long index)
 {
 	struct page *page = find_get_page(mapping, index);
-	unsigned int gfp_mask;
+	gfp_t gfp_mask;
 
 	if (page) {
 		if (!TestSetPageLocked(page))
@@ -1030,8 +1030,8 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 			desc.error = 0;
 			do_generic_file_read(filp,ppos,&desc,file_read_actor);
 			retval += desc.written;
-			if (!retval) {
-				retval = desc.error;
+			if (desc.error) {
+				retval = retval ?: desc.error;
 				break;
 			}
 		}
@@ -1520,7 +1520,7 @@ repeat:
 			page_cache_release(page);
 			return err;
 		}
-	} else {
+	} else if (vma->vm_flags & VM_NONLINEAR) {
 		/* No page was found just because we can't read it in now (being
 		 * here implies nonblock != 0), but the page may exist, so set
 		 * the PTE to fault it in later. */
@@ -1537,6 +1537,7 @@ repeat:
 
 	return 0;
 }
+EXPORT_SYMBOL(filemap_populate);
 
 struct vm_operations_struct generic_file_vm_ops = {
 	.nopage		= filemap_nopage,
@@ -1555,7 +1556,6 @@ int generic_file_mmap(struct file * file, struct vm_area_struct * vma)
 	vma->vm_ops = &generic_file_vm_ops;
 	return 0;
 }
-EXPORT_SYMBOL(filemap_populate);
 
 /*
  * This is for filesystems which do not implement ->writepage.