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Subject[RFC PATCH 03/26] hugetlb: add make_huge_pte_with_shift
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This allows us to make huge PTEs at shifts other than the hstate shift,
which will be necessary for high-granularity mappings.

Signed-off-by: James Houghton <jthoughton@google.com>
---
mm/hugetlb.c | 33 ++++++++++++++++++++-------------
1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 5df838d86f32..0eec34edf3b2 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4686,23 +4686,30 @@ const struct vm_operations_struct hugetlb_vm_ops = {
.pagesize = hugetlb_vm_op_pagesize,
};

+static pte_t make_huge_pte_with_shift(struct vm_area_struct *vma,
+ struct page *page, int writable,
+ int shift)
+{
+ bool huge = shift > PAGE_SHIFT;
+ pte_t entry = huge ? mk_huge_pte(page, vma->vm_page_prot)
+ : mk_pte(page, vma->vm_page_prot);
+
+ if (writable)
+ entry = huge ? huge_pte_mkwrite(entry) : pte_mkwrite(entry);
+ else
+ entry = huge ? huge_pte_wrprotect(entry) : pte_wrprotect(entry);
+ pte_mkyoung(entry);
+ if (huge)
+ entry = arch_make_huge_pte(entry, shift, vma->vm_flags);
+ return entry;
+}
+
static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page,
- int writable)
+ int writable)
{
- pte_t entry;
unsigned int shift = huge_page_shift(hstate_vma(vma));

- if (writable) {
- entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_huge_pte(page,
- vma->vm_page_prot)));
- } else {
- entry = huge_pte_wrprotect(mk_huge_pte(page,
- vma->vm_page_prot));
- }
- entry = pte_mkyoung(entry);
- entry = arch_make_huge_pte(entry, shift, vma->vm_flags);
-
- return entry;
+ return make_huge_pte_with_shift(vma, page, writable, shift);
}

static void set_huge_ptep_writable(struct vm_area_struct *vma,
--
2.37.0.rc0.161.g10f37bed90-goog
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