From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
x86 uses page->lru of the pages used for pgds, but that's not immediately
obvious to anyone looking to make changes. Add a struct list_head to
the union so it's clearly in use for pgds.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
include/linux/mm_types.h | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4aba6c0c2ba8..9bb34e2cd5a5 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -142,8 +142,13 @@ struct page {
struct list_head deferred_list;
};
struct { /* Page table pages */
- unsigned long _pt_pad_1; /* compound_head */
- pgtable_t pmd_huge_pte; /* protected by page->ptl */
+ union {
+ struct list_head pgd_list; /* x86 */
+ struct {
+ unsigned long _pt_pad_1;
+ pgtable_t pmd_huge_pte;
+ };
+ };
unsigned long _pt_pad_2; /* mapping */
union {
struct mm_struct *pt_mm; /* x86 pgds only */
--
2.26.2
