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authorHugh Dickins <hughd@google.com>2011-08-03 16:21:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-03 14:25:24 -1000
commit8079b1c859c44f27d63da4951f5038a16589a563 (patch)
tree677e77a4c9d3b9c33427196cb5f860ebcf530b15 /mm/mincore.c
parente504f3fdd63d486d45b18009e5a65f2e329acb0a (diff)
downloadlinux-8079b1c859c44f27d63da4951f5038a16589a563.tar.gz
mm: clarify the radix_tree exceptional cases
Make the radix_tree exceptional cases, mostly in filemap.c, clearer. It's hard to devise a suitable snappy name that illuminates the use by shmem/tmpfs for swap, while keeping filemap/pagecache/radix_tree generality. And akpm points out that /* radix_tree_deref_retry(page) */ comments look like calls that have been commented out for unknown reason. Skirt the naming difficulty by rearranging these blocks to handle the transient radix_tree_deref_retry(page) case first; then just explain the remaining shmem/tmpfs swap case in a comment. Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mincore.c')
-rw-r--r--mm/mincore.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/mincore.c b/mm/mincore.c
index 733f1829b0d..636a86876ff 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -72,6 +72,7 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
*/
page = find_get_page(mapping, pgoff);
#ifdef CONFIG_SWAP
+ /* shmem/tmpfs may return swap: account for swapcache page too. */
if (radix_tree_exceptional_entry(page)) {
swp_entry_t swap = radix_to_swp_entry(page);
page = find_get_page(&swapper_space, swap.val);