Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "VM:
   - z3fold fixes and enhancements by Henry Burns and Vitaly Wool

   - more accurate reclaimed slab caches calculations by Yafang Shao

   - fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by
     Christoph Hellwig

   - !CONFIG_MMU fixes by Christoph Hellwig

   - new novmcoredd parameter to omit device dumps from vmcore, by
     Kairui Song

   - new test_meminit module for testing heap and pagealloc
     initialization, by Alexander Potapenko

   - ioremap improvements for huge mappings, by Anshuman Khandual

   - generalize kprobe page fault handling, by Anshuman Khandual

   - device-dax hotplug fixes and improvements, by Pavel Tatashin

   - enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V

   - add pte_devmap() support for arm64, by Robin Murphy

   - unify locked_vm accounting with a helper, by Daniel Jordan

   - several misc fixes

  core/lib:
   - new typeof_member() macro including some users, by Alexey Dobriyan

   - make BIT() and GENMASK() available in asm, by Masahiro Yamada

   - changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better
     code generation, by Alexey Dobriyan

   - rbtree code size optimizations, by Michel Lespinasse

   - convert struct pid count to refcount_t, by Joel Fernandes

  get_maintainer.pl:
   - add --no-moderated switch to skip moderated ML's, by Joe Perches

  misc:
   - ptrace PTRACE_GET_SYSCALL_INFO interface

   - coda updates

   - gdb scripts, various"

[ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ]

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits)
  fs/select.c: use struct_size() in kmalloc()
  mm: add account_locked_vm utility function
  arm64: mm: implement pte_devmap support
  mm: introduce ARCH_HAS_PTE_DEVMAP
  mm: clean up is_device_*_page() definitions
  mm/mmap: move common defines to mman-common.h
  mm: move MAP_SYNC to asm-generic/mman-common.h
  device-dax: "Hotremove" persistent memory that is used like normal RAM
  mm/hotplug: make remove_memory() interface usable
  device-dax: fix memory and resource leak if hotplug fails
  include/linux/lz4.h: fix spelling and copy-paste errors in documentation
  ipc/mqueue.c: only perform resource calculation if user valid
  include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures
  scripts/gdb: add helpers to find and list devices
  scripts/gdb: add lx-genpd-summary command
  drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl
  kernel/pid.c: convert struct pid count to refcount_t
  drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings
  select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining()
  select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR
  ...

1 files changed, 15 insertions, 7 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 249671873aa9..cdbb7a84cb6e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -695,12 +695,15 @@ void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val)
         if (mem_cgroup_disabled())
                 return;
 
-        __this_cpu_add(memcg->vmstats_local->stat[idx], val);
-
         x = val + __this_cpu_read(memcg->vmstats_percpu->stat[idx]);
         if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
                 struct mem_cgroup *mi;
 
+                /*
+                 * Batch local counters to keep them in sync with
+                 * the hierarchical ones.
+                 */
+                __this_cpu_add(memcg->vmstats_local->stat[idx], x);
                 for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
                         atomic_long_add(x, &mi->vmstats[idx]);
                 x = 0;
@@ -749,13 +752,15 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
         /* Update memcg */
         __mod_memcg_state(memcg, idx, val);
 
-        /* Update lruvec */
-        __this_cpu_add(pn->lruvec_stat_local->count[idx], val);
-
         x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]);
         if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
                 struct mem_cgroup_per_node *pi;
 
+                /*
+                 * Batch local counters to keep them in sync with
+                 * the hierarchical ones.
+                 */
+                __this_cpu_add(pn->lruvec_stat_local->count[idx], x);
                 for (pi = pn; pi; pi = parent_nodeinfo(pi, pgdat->node_id))
                         atomic_long_add(x, &pi->lruvec_stat[idx]);
                 x = 0;
@@ -777,12 +782,15 @@ void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
         if (mem_cgroup_disabled())
                 return;
 
-        __this_cpu_add(memcg->vmstats_local->events[idx], count);
-
         x = count + __this_cpu_read(memcg->vmstats_percpu->events[idx]);
         if (unlikely(x > MEMCG_CHARGE_BATCH)) {
                 struct mem_cgroup *mi;
 
+                /*
+                 * Batch local counters to keep them in sync with
+                 * the hierarchical ones.
+                 */
+                __this_cpu_add(memcg->vmstats_local->events[idx], x);
                 for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
                         atomic_long_add(x, &mi->vmevents[idx]);
                 x = 0;