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mm/hugetlb: add page_mask for hugetlb_follow_page_mask()

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follow_page() doesn't need it, but we'll start to need it when unifying
gup for hugetlb.

Link: https://lkml.kernel.org/r/20230628215310.73782-4-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kirill A . Shutemov <kirill@shutemov.name>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2023-06-28 17:53:05 -04:00 committed by Andrew Morton
parent 458568c929
commit 5502ea44f5
3 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/hugetlb.h
View File

@ -131,7 +131,8 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma,
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *,
struct vm_area_struct *, struct vm_area_struct *);
struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
unsigned long address, unsigned int flags);
unsigned long address, unsigned int flags,
unsigned int *page_mask);
long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
struct page **, unsigned long *, unsigned long *,
long, unsigned int, int *);
@ -297,8 +298,9 @@ static inline void adjust_range_if_pmd_sharing_possible(
{
}
static inline struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
unsigned long address, unsigned int flags)
static inline struct page *hugetlb_follow_page_mask(
struct vm_area_struct *vma, unsigned long address, unsigned int flags,
unsigned int *page_mask)
{
BUILD_BUG(); /* should never be compiled in if !CONFIG_HUGETLB_PAGE*/
}

3
mm/gup.c
View File

@ -824,7 +824,8 @@ static struct page *follow_page_mask(struct vm_area_struct *vma,
* Ordinary GUP uses follow_hugetlb_page for hugetlb processing.
*/
if (is_vm_hugetlb_page(vma))
return hugetlb_follow_page_mask(vma, address, flags);
return hugetlb_follow_page_mask(vma, address, flags,
&ctx->page_mask);
pgd = pgd_offset(mm, address);

5
mm/hugetlb.c
View File

@ -6454,7 +6454,8 @@ static inline bool __follow_hugetlb_must_fault(struct vm_area_struct *vma,
}
struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
unsigned long address, unsigned int flags)
unsigned long address, unsigned int flags,
unsigned int *page_mask)
{
struct hstate *h = hstate_vma(vma);
struct mm_struct *mm = vma->vm_mm;
@ -6504,6 +6505,8 @@ struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
page = ERR_PTR(ret);
goto out;
}
*page_mask = (1U << huge_page_order(h)) - 1;
}
out:
spin_unlock(ptl);