diff options
| author | Matthew Wilcox <[email protected]> | 2018-06-07 17:08:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2018-06-07 17:34:37 -0700 |
| commit | a052f0a5168ef99c517f6638aaec59f39060f81d (patch) | |
| tree | 9fd7579eafc6cf0f74ae16f25f5300afaed8be55 | |
| parent | 97b4a671987123009724dfbdf188ec6e122573d4 (diff) | |
mm: add pt_mm to struct page
For pgd page table pages, x86 overloads the page->index field to store a
pointer to the mm_struct. Rename this to pt_mm so it's visible to other
users.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Jérôme Glisse <[email protected]>
Cc: "Kirill A . Shutemov" <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | arch/x86/mm/pgtable.c | 5 | ||||
| -rw-r--r-- | include/linux/mm_types.h | 2 |
2 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index ffc8c13c50e4..938dbcd46b97 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -114,13 +114,12 @@ static inline void pgd_list_del(pgd_t *pgd) static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm) { - BUILD_BUG_ON(sizeof(virt_to_page(pgd)->index) < sizeof(mm)); - virt_to_page(pgd)->index = (pgoff_t)mm; + virt_to_page(pgd)->pt_mm = mm; } struct mm_struct *pgd_page_get_mm(struct page *page) { - return (struct mm_struct *)page->index; + return page->pt_mm; } static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 9b45760cc797..811aa0c71e1a 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -139,7 +139,7 @@ struct page { unsigned long _pt_pad_1; /* compound_head */ pgtable_t pmd_huge_pte; /* protected by page->ptl */ unsigned long _pt_pad_2; /* mapping */ - unsigned long _pt_pad_3; + struct mm_struct *pt_mm; /* x86 pgds only */ #if ALLOC_SPLIT_PTLOCKS spinlock_t *ptl; #else |