Commit ea919671 authored by Qi Zheng's avatar Qi Zheng Committed by Andrew Morton
Browse files

mm: pgtable: add missing pt_index to struct ptdesc 

In s390, the page->index field is used for gmap (see gmap_shadow_pgt()),
so add the corresponding pt_index to struct ptdesc and add a comment to
clarify this.

Link: https://lkml.kernel.org/r/283624c2af45fb2090b41a6b1b5481bb0a45bad7.1709541697.git.zhengqi.arch@bytedance.com


Signed-off-by: default avatarQi Zheng <zhengqi.arch@bytedance.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 22beb471

include/linux/mm_types.h

+3 −0
Original line number Diff line number Diff line
@@ -425,6 +425,7 @@ FOLIO_MATCH(compound_head, _head_2a); 
 * @_pt_pad_1:        Padding that aliases with page's compound head.

 * @pmd_huge_pte:     Protected by ptdesc->ptl, used for THPs.

 * @__page_mapping:   Aliases with page->mapping. Unused for page tables.

 * @pt_index:         Used for s390 gmap.

 * @pt_mm:            Used for x86 pgds.

 * @pt_frag_refcount: For fragmented page table tracking. Powerpc only.

 * @_pt_pad_2:        Padding to ensure proper alignment.
@@ -450,6 +451,7 @@ struct ptdesc { 
	unsigned long __page_mapping;



	union {

		pgoff_t pt_index;

		struct mm_struct *pt_mm;

		atomic_t pt_frag_refcount;

	};
@@ -475,6 +477,7 @@ TABLE_MATCH(flags, __page_flags); 
TABLE_MATCH(compound_head, pt_list);

TABLE_MATCH(compound_head, _pt_pad_1);

TABLE_MATCH(mapping, __page_mapping);

TABLE_MATCH(index, pt_index);

TABLE_MATCH(rcu_head, pt_rcu_head);

TABLE_MATCH(page_type, __page_type);

TABLE_MATCH(_refcount, __page_refcount);