Merge branch 'akpm' (fixes from Andrew Morton)

Merge misc fixes from Andrew Morton.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (21 commits)
  mm: revert mremap pud_free anti-fix
  mm: fix BUG in __split_huge_page_pmd
  swap: fix set_blocksize race during swapon/swapoff
  procfs: call default get_unmapped_area on MMU-present architectures
  procfs: fix unintended truncation of returned mapped address
  writeback: fix negative bdi max pause
  percpu_refcount: export symbols
  fs: buffer: move allocation failure loop into the allocator
  mm: memcg: handle non-error OOM situations more gracefully
  tools/testing/selftests: fix uninitialized variable
  block/partitions/efi.c: treat size mismatch as a warning, not an error
  mm: hugetlb: initialize PG_reserved for tail pages of gigantic compound pages
  mm/zswap: bugfix: memory leak when re-swapon
  mm: /proc/pid/pagemap: inspect _PAGE_SOFT_DIRTY only on present pages
  mm: migration: do not lose soft dirty bit if page is in migration state
  gcov: MAINTAINERS: Add an entry for gcov
  mm/hugetlb.c: correct missing private flag clearing
  mm/vmscan.c: don't forget to free shrinker->nr_deferred
  ipc/sem.c: synchronize semop and semctl with IPC_RMID
  ipc: update locking scheme comments
  ...

3 files changed, 22 insertions, 6 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index 4d7433534f5c..6024877335ca 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1005,9 +1005,19 @@ grow_dev_page(struct block_device *bdev, sector_t block,
         struct buffer_head *bh;
         sector_t end_block;
         int ret = 0;            /* Will call free_more_memory() */
+        gfp_t gfp_mask;
 
-        page = find_or_create_page(inode->i_mapping, index,
-                (mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS)|__GFP_MOVABLE);
+        gfp_mask = mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS;
+        gfp_mask |= __GFP_MOVABLE;
+        /*
+         * XXX: __getblk_slow() can not really deal with failure and
+         * will endlessly loop on improvised global reclaim.  Prefer
+         * looping in the allocator rather than here, at least that
+         * code knows what it's doing.
+         */
+        gfp_mask |= __GFP_NOFAIL;
+
+        page = find_or_create_page(inode->i_mapping, index, gfp_mask);
         if (!page)
                 return ret;
 
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 9f8ef9b7674d..8eaa1ba793fc 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -288,10 +288,14 @@ static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma)
 static unsigned long proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 {
         struct proc_dir_entry *pde = PDE(file_inode(file));
-        int rv = -EIO;
-        unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+        unsigned long rv = -EIO;
+        unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long) = NULL;
         if (use_pde(pde)) {
-                get_unmapped_area = pde->proc_fops->get_unmapped_area;
+#ifdef CONFIG_MMU
+                get_unmapped_area = current->mm->get_unmapped_area;
+#endif
+                if (pde->proc_fops->get_unmapped_area)
+                        get_unmapped_area = pde->proc_fops->get_unmapped_area;
                 if (get_unmapped_area)
                         rv = get_unmapped_area(file, orig_addr, len, pgoff, flags);
                 unuse_pde(pde);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 7366e9d63cee..390bdab01c3c 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -941,6 +941,8 @@ static void pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm,
                 frame = pte_pfn(pte);
                 flags = PM_PRESENT;
                 page = vm_normal_page(vma, addr, pte);
+                if (pte_soft_dirty(pte))
+                        flags2 |= __PM_SOFT_DIRTY;
         } else if (is_swap_pte(pte)) {
                 swp_entry_t entry;
                 if (pte_swp_soft_dirty(pte))
@@ -960,7 +962,7 @@ static void pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm,
 
         if (page && !PageAnon(page))
                 flags |= PM_FILE;
-        if ((vma->vm_flags & VM_SOFTDIRTY) || pte_soft_dirty(pte))
+        if ((vma->vm_flags & VM_SOFTDIRTY))
                 flags2 |= __PM_SOFT_DIRTY;
 
         *pme = make_pme(PM_PFRAME(frame) | PM_STATUS2(pm->v2, flags2) | flags);