[mmotm:master 264/276] mm/migrate.c:2491:23: warning: passing argument 2 of 'pud_alloc' from incompatible pointer type

[mmotm:master 264/276] mm/migrate.c:2491:23: warning: passing argument 2 of 'pud_alloc' from incompatible pointer type

[kbuild test robot]

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   5b220005fda0593464fc4549eea586e597bf783c
commit: ef10b10b090d7d9b151e774c6186daae983d9ef8 [264/276] mm/migrate: allow migrate_vma() to alloc new page on empty entry
config: x86_64-randconfig-i0-201714 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout ef10b10b090d7d9b151e774c6186daae983d9ef8
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   mm/migrate.c: In function 'migrate_vma_insert_page':
>> mm/migrate.c:2491:23: warning: passing argument 2 of 'pud_alloc' from incompatible pointer type
     pudp = pud_alloc(mm, pgdp, addr);
                          ^
   In file included from include/linux/migrate.h:4:0,
                    from mm/migrate.c:15:
   include/linux/mm.h:1677:22: note: expected 'struct p4d_t *' but argument is of type 'struct pgd_t *'
    static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d,
                         ^

vim +/pud_alloc +2491 mm/migrate.c

  2475	{
  2476		struct vm_area_struct *vma = migrate->vma;
  2477		struct mm_struct *mm = vma->vm_mm;
  2478		struct mem_cgroup *memcg;
  2479		spinlock_t *ptl;
  2480		pgd_t *pgdp;
  2481		pud_t *pudp;
  2482		pmd_t *pmdp;
  2483		pte_t *ptep;
  2484		pte_t entry;
  2485	
  2486		/* Only allow populating anonymous memory */
  2487		if (!vma_is_anonymous(vma))
  2488			goto abort;
  2489	
  2490		pgdp = pgd_offset(mm, addr);
> 2491		pudp = pud_alloc(mm, pgdp, addr);
  2492		if (!pudp)
  2493			goto abort;
  2494		pmdp = pmd_alloc(mm, pudp, addr);
  2495		if (!pmdp)
  2496			goto abort;
  2497	
  2498		if (pmd_trans_unstable(pmdp) || pmd_devmap(*pmdp))
  2499			goto abort;

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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