Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - a few misc things

 - ocfs2 updates

 - the v9fs maintainers have been missing for a long time. I've taken
   over v9fs patch slinging.

 - most of MM

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (116 commits)
  mm,oom_reaper: check for MMF_OOM_SKIP before complaining
  mm/ksm: fix interaction with THP
  mm/memblock.c: cast constant ULLONG_MAX to phys_addr_t
  headers: untangle kmemleak.h from mm.h
  include/linux/mmdebug.h: make VM_WARN* non-rvals
  mm/page_isolation.c: make start_isolate_page_range() fail if already isolated
  mm: change return type to vm_fault_t
  mm, oom: remove 3% bonus for CAP_SYS_ADMIN processes
  mm, page_alloc: wakeup kcompactd even if kswapd cannot free more memory
  kernel/fork.c: detect early free of a live mm
  mm: make counting of list_lru_one::nr_items lockless
  mm/swap_state.c: make bool enable_vma_readahead and swap_vma_readahead() static
  block_invalidatepage(): only release page if the full page was invalidated
  mm: kernel-doc: add missing parameter descriptions
  mm/swap.c: remove @cold parameter description for release_pages()
  mm/nommu: remove description of alloc_vm_area
  zram: drop max_zpage_size and use zs_huge_class_size()
  zsmalloc: introduce zs_huge_class_size()
  mm: fix races between swapoff and flush dcache
  fs/direct-io.c: minor cleanups in do_blockdev_direct_IO
  ...

1 files changed, 16 insertions, 0 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 8291b75f42c8..2d4bf647cf01 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -502,6 +502,7 @@ static const char * const action_page_types[] = {
 	[MF_MSG_POISONED_HUGE]		= "huge page already hardware poisoned",
 	[MF_MSG_HUGE]			= "huge page",
 	[MF_MSG_FREE_HUGE]		= "free huge page",
+	[MF_MSG_NON_PMD_HUGE]		= "non-pmd-sized huge page",
 	[MF_MSG_UNMAP_FAILED]		= "unmapping failed page",
 	[MF_MSG_DIRTY_SWAPCACHE]	= "dirty swapcache page",
 	[MF_MSG_CLEAN_SWAPCACHE]	= "clean swapcache page",
@@ -1084,6 +1085,21 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
 		return 0;
 	}
 
+	/*
+	 * TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
+	 * simply disable it. In order to make it work properly, we need
+	 * make sure that:
+	 *  - conversion of a pud that maps an error hugetlb into hwpoison
+	 *    entry properly works, and
+	 *  - other mm code walking over page table is aware of pud-aligned
+	 *    hwpoison entries.
+	 */
+	if (huge_page_size(page_hstate(head)) > PMD_SIZE) {
+		action_result(pfn, MF_MSG_NON_PMD_HUGE, MF_IGNORED);
+		res = -EBUSY;
+		goto out;
+	}
+
 	if (!hwpoison_user_mappings(p, pfn, flags, &head)) {
 		action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED);
 		res = -EBUSY;