Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:

 - "fork: unconditionally clear stack on fork" is a non-bugfix which got
   lost during the merge window - performance concerns appear to have
   been adequately addressed.

 - and a bunch of fixes

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
  mm: memcg: add __GFP_NOWARN in __memcg_schedule_kmem_cache_create()
  fs, elf: don't complain MAP_FIXED_NOREPLACE unless -EEXIST error
  kexec_file: do not add extra alignment to efi memmap
  proc: fix /proc/loadavg regression
  proc: revalidate kernel thread inodes to root:root
  autofs: mount point create should honour passed in mode
  MAINTAINERS: add personal addresses for Sascha and Uwe
  kasan: add no_sanitize attribute for clang builds
  rapidio: fix rio_dma_transfer error handling
  mm: enable thp migration for shmem thp
  writeback: safer lock nesting
  mm, pagemap: fix swap offset value for PMD migration entry
  mm: fix do_pages_move status handling
  fork: unconditionally clear stack on fork

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index bfe86b54f6c1..0bd432a4d7bd 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -223,6 +223,11 @@ static inline void set_bdi_congested(struct backing_dev_info *bdi, int sync)
 	set_wb_congested(bdi->wb.congested, sync);
 }
 
+struct wb_lock_cookie {
+	bool locked;
+	unsigned long flags;
+};
+
 #ifdef CONFIG_CGROUP_WRITEBACK
 
 /**