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Commit a052f0a5 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Linus Torvalds
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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@infradead.org


Signed-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 97b4a671

arch/x86/mm/pgtable.c

+2 −3
Original line number Diff line number Diff line
@@ -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)

include/linux/mm_types.h

+1 −1
Original line number Diff line number Diff line
@@ -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