We cannot use the pte value used in set_pte_at for pte_same comparison,
because archs like ppc64, filter/add new pte flag in set_pte_at. Instead
fetch the pte value inside hugetlb_cow. We are comparing pte value to
make sure the pte didn't change since we dropped the page table lock.
hugetlb_cow get called with page table lock held, and we can take a copy
of the pte value before we drop the page table lock.

With hugetlbfs, we optimize the MAP_PRIVATE write fault path with no
previous mapping (huge_pte_none entries), by forcing a cow in the fault
path. This avoid take an addition fault to covert a read-only mapping
to read/write. Here we were comparing a recently instantiated pte (via
set_pte_at) to the pte values from linux page table. As explained above
on ppc64 such pte_same check returned wrong result, resulting in us
taking an additional fault on ppc64.

Fixes: 6a119eae942c ("powerpc/mm: Add a _PAGE_PTE bit")

Reported-by: Jan Stancek <jstan...@redhat.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
 mm/hugetlb.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ec49d9ef1eef..da8fbd02b92e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3386,15 +3386,17 @@ static void unmap_ref_private(struct mm_struct *mm, 
struct vm_area_struct *vma,
  * Keep the pte_same checks anyway to make transition from the mutex easier.
 static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
-                       unsigned long address, pte_t *ptep, pte_t pte,
-                       struct page *pagecache_page, spinlock_t *ptl)
+                      unsigned long address, pte_t *ptep,
+                      struct page *pagecache_page, spinlock_t *ptl)
+       pte_t pte;
        struct hstate *h = hstate_vma(vma);
        struct page *old_page, *new_page;
        int ret = 0, outside_reserve = 0;
        unsigned long mmun_start;       /* For mmu_notifiers */
        unsigned long mmun_end;         /* For mmu_notifiers */
+       pte = huge_ptep_get(ptep);
        old_page = pte_page(pte);
@@ -3668,7 +3670,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct 
vm_area_struct *vma,
        hugetlb_count_add(pages_per_huge_page(h), mm);
        if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
                /* Optimization, do the COW without a second fault */
-               ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl);
+               ret = hugetlb_cow(mm, vma, address, ptep, page, ptl);
@@ -3822,8 +3824,8 @@ int hugetlb_fault(struct mm_struct *mm, struct 
vm_area_struct *vma,
        if (flags & FAULT_FLAG_WRITE) {
                if (!huge_pte_write(entry)) {
-                       ret = hugetlb_cow(mm, vma, address, ptep, entry,
-                                       pagecache_page, ptl);
+                       ret = hugetlb_cow(mm, vma, address, ptep,
+                                         pagecache_page, ptl);
                        goto out_put_page;
                entry = huge_pte_mkdirty(entry);

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