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authorMatthew Wilcox <willy@infradead.org>2017-11-03 20:30:42 +0300
committerMatthew Wilcox <willy@infradead.org>2018-09-30 05:47:49 +0300
commit3159f943aafdbacb2f94c38fdaadabf2bbde2a14 (patch)
tree7e06823a1ab7e90774535d17a217a939bdddda3b /mm/khugepaged.c
parent66ee620f06f99d72475db6eb638559ba608c7dee (diff)
downloadlinux-3159f943aafdbacb2f94c38fdaadabf2bbde2a14.tar.xz
xarray: Replace exceptional entries
Introduce xarray value entries and tagged pointers to replace radix tree exceptional entries. This is a slight change in encoding to allow the use of an extra bit (we can now store BITS_PER_LONG - 1 bits in a value entry). It is also a change in emphasis; exceptional entries are intimidating and different. As the comment explains, you can choose to store values or pointers in the xarray and they are both first-class citizens. Signed-off-by: Matthew Wilcox <willy@infradead.org> Reviewed-by: Josef Bacik <jbacik@fb.com>
Diffstat (limited to 'mm/khugepaged.c')
-rw-r--r--mm/khugepaged.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a31d740e6cd1..4820e4adf853 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1369,7 +1369,7 @@ static void collapse_shmem(struct mm_struct *mm,
page = radix_tree_deref_slot_protected(slot,
&mapping->i_pages.xa_lock);
- if (radix_tree_exceptional_entry(page) || !PageUptodate(page)) {
+ if (xa_is_value(page) || !PageUptodate(page)) {
xa_unlock_irq(&mapping->i_pages);
/* swap in or instantiate fallocated page */
if (shmem_getpage(mapping->host, index, &page,