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mm: add pt_mm to struct page

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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: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Vlastimil 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2018-06-07 17:08:57 -07:00 committed by Linus Torvalds
parent 97b4a67198
commit a052f0a516
2 changed files with 3 additions and 4 deletions
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5
arch/x86/mm/pgtable.c
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@ -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) 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)->pt_mm = mm;
virt_to_page(pgd)->index = (pgoff_t)mm;
} }
struct mm_struct *pgd_page_get_mm(struct page *page) 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) static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)

2
include/linux/mm_types.h
View File

@ -139,7 +139,7 @@ struct page {
unsigned long _pt_pad_1; /* compound_head */ unsigned long _pt_pad_1; /* compound_head */
pgtable_t pmd_huge_pte; /* protected by page->ptl */ pgtable_t pmd_huge_pte; /* protected by page->ptl */
unsigned long _pt_pad_2; /* mapping */ unsigned long _pt_pad_2; /* mapping */
unsigned long _pt_pad_3; struct mm_struct *pt_mm; /* x86 pgds only */
#if ALLOC_SPLIT_PTLOCKS #if ALLOC_SPLIT_PTLOCKS
spinlock_t *ptl; spinlock_t *ptl;
#else #else