[PATCH V3 3/6] powerpc/mm/book3s: Check for pmd_large instead of pmd_trans_huge

[Aneesh Kumar K.V]

Update few code paths to check for pmd_large.

set_pmd_at:
We want to use this to store swap pte at pmd level. For swap ptes we don't want
to set H_PAGE_THP_HUGE. Hence check for pmd_large in set_pmd_at. This remove
the false WARN_ON when using this with swap pmd entry.

pmd_page:
We don't really use them on pmd migration entries. But they can also work with
migration entries and we don't differentiate at the pte level. Hence update
pmd_page to work with pmd migration entries too

__find_linux_pte:
lockless page table walk need to handle pmd migration entries. pmd_trans_huge
check will return false on them. We don't set thp = 1 for such entries, but
update hpage_shift correctly. Without this we will walk pmd migration entries
as a pte page pointer which is wrong.

Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
 arch/powerpc/mm/hugetlbpage.c      | 8 ++++++--
 arch/powerpc/mm/pgtable-book3s64.c | 2 +-
 arch/powerpc/mm/pgtable_64.c       | 2 +-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index c6df73c66c40..9504641bd4d9 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -837,8 +837,12 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
                                ret_pte = (pte_t *) pmdp;
                                goto out;
                        }
-
-                       if (pmd_huge(pmd)) {
+                       /*
+                        * pmd_large check below will handle the swap pmd pte
+                        * we need to do both the check because they are config
+                        * dependent.
+                        */
+                       if (pmd_huge(pmd) || pmd_large(pmd)) {
                                ret_pte = (pte_t *) pmdp;
                                goto out;
                        } else if (is_hugepd(__hugepd(pmd_val(pmd))))
diff --git a/arch/powerpc/mm/pgtable-book3s64.c 
b/arch/powerpc/mm/pgtable-book3s64.c
index 654000da8b15..43e99e1d947b 100644
--- a/arch/powerpc/mm/pgtable-book3s64.c
+++ b/arch/powerpc/mm/pgtable-book3s64.c
@@ -75,7 +75,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
         */
        WARN_ON(pte_val(pmd_pte(*pmdp)) & _PAGE_PRESENT);
        assert_spin_locked(pmd_lockptr(mm, pmdp));
-       WARN_ON(!(pmd_trans_huge(pmd) || pmd_devmap(pmd)));
+       WARN_ON(!(pmd_large(pmd) || pmd_devmap(pmd)));
 #endif
        trace_hugepage_set_pmd(addr, pmd_val(pmd));
        return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 53e9eeecd5d4..e15e63079ba8 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -306,7 +306,7 @@ struct page *pud_page(pud_t pud)
  */
 struct page *pmd_page(pmd_t pmd)
 {
-       if (pmd_trans_huge(pmd) || pmd_huge(pmd) || pmd_devmap(pmd))
+       if (pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd))
                return pte_page(pmd_pte(pmd));
        return virt_to_page(pmd_page_vaddr(pmd));
 }
-- 
2.17.1