iio: pressure: bmp280: add support for BMP180

[karo-tx-linux.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 61b441b191adc5bcae5e7b98558b7705a75240a9..a8c69c8c0a90a1e50cfdc822ce2cbc3854e0c8e8 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -586,7 +586,7 @@ static int page_cache_tree_insert(struct address_space *mapping,
        void **slot;
        int error;
 
-       error = __radix_tree_create(&mapping->page_tree, page->index,
+       error = __radix_tree_create(&mapping->page_tree, page->index, 0,
                                    &node, &slot);
        if (error)
                return error;
@@ -1255,7 +1255,6 @@ unsigned find_get_entries(struct address_space *mapping,
                return 0;
 
        rcu_read_lock();
-restart:
        radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
                struct page *page;
 repeat:
@@ -1263,8 +1262,10 @@ repeat:
                if (unlikely(!page))
                        continue;
                if (radix_tree_exception(page)) {
-                       if (radix_tree_deref_retry(page))
-                               goto restart;
+                       if (radix_tree_deref_retry(page)) {
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
+                       }
                        /*
                         * A shadow entry of a recently evicted page, a swap
                         * entry from shmem/tmpfs or a DAX entry.  Return it
@@ -1317,7 +1318,6 @@ unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
                return 0;
 
        rcu_read_lock();
-restart:
        radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
                struct page *page;
 repeat:
@@ -1327,13 +1327,8 @@ repeat:
 
                if (radix_tree_exception(page)) {
                        if (radix_tree_deref_retry(page)) {
-                               /*
-                                * Transient condition which can only trigger
-                                * when entry at index 0 moves out of or back
-                                * to root: none yet gotten, safe to restart.
-                                */
-                               WARN_ON(iter.index);
-                               goto restart;
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
                        }
                        /*
                         * A shadow entry of a recently evicted page,
@@ -1384,7 +1379,6 @@ unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
                return 0;
 
        rcu_read_lock();
-restart:
        radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, index) {
                struct page *page;
 repeat:
@@ -1395,12 +1389,8 @@ repeat:
 
                if (radix_tree_exception(page)) {
                        if (radix_tree_deref_retry(page)) {
-                               /*
-                                * Transient condition which can only trigger
-                                * when entry at index 0 moves out of or back
-                                * to root: none yet gotten, safe to restart.
-                                */
-                               goto restart;
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
                        }
                        /*
                         * A shadow entry of a recently evicted page,
@@ -1460,7 +1450,6 @@ unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *index,
                return 0;
 
        rcu_read_lock();
-restart:
        radix_tree_for_each_tagged(slot, &mapping->page_tree,
                                   &iter, *index, tag) {
                struct page *page;
@@ -1471,12 +1460,8 @@ repeat:
 
                if (radix_tree_exception(page)) {
                        if (radix_tree_deref_retry(page)) {
-                               /*
-                                * Transient condition which can only trigger
-                                * when entry at index 0 moves out of or back
-                                * to root: none yet gotten, safe to restart.
-                                */
-                               goto restart;
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
                        }
                        /*
                         * A shadow entry of a recently evicted page.
@@ -1539,7 +1524,6 @@ unsigned find_get_entries_tag(struct address_space *mapping, pgoff_t start,
                return 0;
 
        rcu_read_lock();
-restart:
        radix_tree_for_each_tagged(slot, &mapping->page_tree,
                                   &iter, start, tag) {
                struct page *page;
@@ -1549,12 +1533,8 @@ repeat:
                        continue;
                if (radix_tree_exception(page)) {
                        if (radix_tree_deref_retry(page)) {
-                               /*
-                                * Transient condition which can only trigger
-                                * when entry at index 0 moves out of or back
-                                * to root: none yet gotten, safe to restart.
-                                */
-                               goto restart;
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
                        }
 
                        /*
@@ -1860,15 +1840,16 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
        ssize_t retval = 0;
        loff_t *ppos = &iocb->ki_pos;
        loff_t pos = *ppos;
+       size_t count = iov_iter_count(iter);
+
+       if (!count)
+               goto out; /* skip atime */
 
        if (iocb->ki_flags & IOCB_DIRECT) {
                struct address_space *mapping = file->f_mapping;
                struct inode *inode = mapping->host;
-               size_t count = iov_iter_count(iter);
                loff_t size;
 
-               if (!count)
-                       goto out; /* skip atime */
                size = i_size_read(inode);
                retval = filemap_write_and_wait_range(mapping, pos,
                                        pos + count - 1);
@@ -2171,10 +2152,11 @@ repeat:
                if (unlikely(!page))
                        goto next;
                if (radix_tree_exception(page)) {
-                       if (radix_tree_deref_retry(page))
-                               break;
-                       else
-                               goto next;
+                       if (radix_tree_deref_retry(page)) {
+                               slot = radix_tree_iter_retry(&iter);
+                               continue;
+                       }
+                       goto next;
                }
 
                if (!page_cache_get_speculative(page))