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| author | Matthew Wilcox <willy@infradead.org> | 2017-11-03 18:30:42 +0100 |
|---|---|---|
| committer | Matthew Wilcox <willy@infradead.org> | 2018-09-30 04:47:49 +0200 |
| commit | 3159f943aafdbacb2f94c38fdaadabf2bbde2a14 (patch) | |
| tree | 7e06823a1ab7e90774535d17a217a939bdddda3b /mm/khugepaged.c | |
| parent | idr: Permit any valid kernel pointer to be stored (diff) | |
| download | linux-3159f943aafdbacb2f94c38fdaadabf2bbde2a14.tar.xz linux-3159f943aafdbacb2f94c38fdaadabf2bbde2a14.zip | |
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.c | 2 |
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, |