Merge branch 'akpm' (Andrew's patch-bomb)

Merge Andrew's second set of patches:
 - MM
 - a few random fixes
 - a couple of RTC leftovers

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (120 commits)
  rtc/rtc-88pm80x: remove unneed devm_kfree
  rtc/rtc-88pm80x: assign ret only when rtc_register_driver fails
  mm: hugetlbfs: close race during teardown of hugetlbfs shared page tables
  tmpfs: distribute interleave better across nodes
  mm: remove redundant initialization
  mm: warn if pg_data_t isn't initialized with zero
  mips: zero out pg_data_t when it's allocated
  memcg: gix memory accounting scalability in shrink_page_list
  mm/sparse: remove index_init_lock
  mm/sparse: more checks on mem_section number
  mm/sparse: optimize sparse_index_alloc
  memcg: add mem_cgroup_from_css() helper
  memcg: further prevent OOM with too many dirty pages
  memcg: prevent OOM with too many dirty pages
  mm: mmu_notifier: fix freed page still mapped in secondary MMU
  mm: memcg: only check anon swapin page charges for swap cache
  mm: memcg: only check swap cache pages for repeated charging
  mm: memcg: split swapin charge function into private and public part
  mm: memcg: remove needless !mm fixup to init_mm when charging
  mm: memcg: remove unneeded shmem charge type
  ...

1 files changed, 35 insertions, 5 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index e067f8c18f88..b3730239bf18 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -621,6 +621,7 @@ enum sock_flags {
         SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
         SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
         SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
+        SOCK_MEMALLOC, /* VM depends on this socket for swapping */
         SOCK_TIMESTAMPING_TX_HARDWARE,  /* %SOF_TIMESTAMPING_TX_HARDWARE */
         SOCK_TIMESTAMPING_TX_SOFTWARE,  /* %SOF_TIMESTAMPING_TX_SOFTWARE */
         SOCK_TIMESTAMPING_RX_HARDWARE,  /* %SOF_TIMESTAMPING_RX_HARDWARE */
@@ -658,6 +659,26 @@ static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
         return test_bit(flag, &sk->sk_flags);
 }
 
+#ifdef CONFIG_NET
+extern struct static_key memalloc_socks;
+static inline int sk_memalloc_socks(void)
+{
+        return static_key_false(&memalloc_socks);
+}
+#else
+
+static inline int sk_memalloc_socks(void)
+{
+        return 0;
+}
+
+#endif
+
+static inline gfp_t sk_gfp_atomic(struct sock *sk, gfp_t gfp_mask)
+{
+        return GFP_ATOMIC | (sk->sk_allocation & __GFP_MEMALLOC);
+}
+
 static inline void sk_acceptq_removed(struct sock *sk)
 {
         sk->sk_ack_backlog--;
@@ -733,8 +754,13 @@ static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *s
         return 0;
 }
 
+extern int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+
 static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
 {
+        if (sk_memalloc_socks() && skb_pfmemalloc(skb))
+                return __sk_backlog_rcv(sk, skb);
+
         return sk->sk_backlog_rcv(sk, skb);
 }
 
@@ -798,6 +824,8 @@ extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
 extern void sk_stream_wait_close(struct sock *sk, long timeo_p);
 extern int sk_stream_error(struct sock *sk, int flags, int err);
 extern void sk_stream_kill_queues(struct sock *sk);
+extern void sk_set_memalloc(struct sock *sk);
+extern void sk_clear_memalloc(struct sock *sk);
 
 extern int sk_wait_data(struct sock *sk, long *timeo);
 
@@ -913,7 +941,7 @@ struct proto {
 #ifdef SOCK_REFCNT_DEBUG
         atomic_t                socks;
 #endif
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+#ifdef CONFIG_MEMCG_KMEM
         /*
          * cgroup specific init/deinit functions. Called once for all
          * protocols that implement it, from cgroups populate function.
@@ -994,7 +1022,7 @@ inline void sk_refcnt_debug_release(const struct sock *sk)
 #define sk_refcnt_debug_release(sk) do { } while (0)
 #endif /* SOCK_REFCNT_DEBUG */
 
-#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET)
+#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET)
 extern struct static_key memcg_socket_limit_enabled;
 static inline struct cg_proto *parent_cg_proto(struct proto *proto,
                                                struct cg_proto *cg_proto)
@@ -1301,12 +1329,14 @@ static inline bool sk_wmem_schedule(struct sock *sk, int size)
                 __sk_mem_schedule(sk, size, SK_MEM_SEND);
 }
 
-static inline bool sk_rmem_schedule(struct sock *sk, int size)
+static inline bool
+sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, unsigned int size)
 {
         if (!sk_has_account(sk))
                 return true;
-        return size <= sk->sk_forward_alloc ||
-                __sk_mem_schedule(sk, size, SK_MEM_RECV);
+        return size<= sk->sk_forward_alloc ||
+                __sk_mem_schedule(sk, size, SK_MEM_RECV) ||
+                skb_pfmemalloc(skb);
 }
 
 static inline void sk_mem_reclaim(struct sock *sk)