thp: cleanup: introduce mk_huge_pmd()

Introduce mk_huge_pmd() to simplify the code

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Ni zhan Chen <nizhan.chen@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 9 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 26002683a16c..ea5fb93a53a9 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -606,6 +606,15 @@ static inline pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma)
         return pmd;
 }
 
+static inline pmd_t mk_huge_pmd(struct page *page, struct vm_area_struct *vma)
+{
+        pmd_t entry;
+        entry = mk_pmd(page, vma->vm_page_prot);
+        entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
+        entry = pmd_mkhuge(entry);
+        return entry;
+}
+
 static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
                                         struct vm_area_struct *vma,
                                         unsigned long haddr, pmd_t *pmd,
@@ -629,9 +638,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
                 pte_free(mm, pgtable);
         } else {
                 pmd_t entry;
-                entry = mk_pmd(page, vma->vm_page_prot);
-                entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
-                entry = pmd_mkhuge(entry);
+                entry = mk_huge_pmd(page, vma);
                 /*
                  * The spinlocking to take the lru_lock inside
                  * page_add_new_anon_rmap() acts as a full memory
@@ -951,9 +958,7 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
         } else {
                 pmd_t entry;
                 VM_BUG_ON(!PageHead(page));
-                entry = mk_pmd(new_page, vma->vm_page_prot);
-                entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
-                entry = pmd_mkhuge(entry);
+                entry = mk_huge_pmd(new_page, vma);
                 pmdp_clear_flush(vma, haddr, pmd);
                 page_add_new_anon_rmap(new_page, vma, haddr);
                 set_pmd_at(mm, haddr, pmd, entry);
@@ -2000,9 +2005,7 @@ static void collapse_huge_page(struct mm_struct *mm,
         __SetPageUptodate(new_page);
         pgtable = pmd_pgtable(_pmd);
 
-        _pmd = mk_pmd(new_page, vma->vm_page_prot);
-        _pmd = maybe_pmd_mkwrite(pmd_mkdirty(_pmd), vma);
-        _pmd = pmd_mkhuge(_pmd);
+        _pmd = mk_huge_pmd(new_page, vma);
 
         /*
          * spin_lock() below is not the equivalent of smp_wmb(), so