follow_page() doesn't need it, but we'll start to need it when unifying gup
for hugetlb.
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
include/linux/hugetlb.h | 8 +++++---
mm/gup.c | 3 ++-
mm/hugetlb.c | 5 ++++-
3 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index ca3c8e10f24a..9f282f370d96 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -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*/
}
diff --git a/mm/gup.c b/mm/gup.c
index 06bc2e31f209..1e2e23084f3c 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -780,7 +780,8 @@ 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);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 4410139cf890..15e82a8a2b76 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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);
--
2.41.0
