From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Subject: 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/20180518194519.3820-13-willy@xxxxxxxxxxxxx Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: Jérôme Glisse <jglisse@xxxxxxxxxx> Cc: "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxx> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/x86/mm/pgtable.c | 5 ++--- include/linux/mm_types.h | 2 +- 2 files changed, 3 insertions(+), 4 deletions(-) diff -puN arch/x86/mm/pgtable.c~mm-add-pt_mm-to-struct-page arch/x86/mm/pgtable.c --- a/arch/x86/mm/pgtable.c~mm-add-pt_mm-to-struct-page +++ a/arch/x86/mm/pgtable.c @@ -114,13 +114,12 @@ static inline void pgd_list_del(pgd_t *p 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 -puN include/linux/mm_types.h~mm-add-pt_mm-to-struct-page include/linux/mm_types.h --- a/include/linux/mm_types.h~mm-add-pt_mm-to-struct-page +++ a/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 _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
