Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:
 "118 patches:

   - The rest of MM.

     Includes kfence - another runtime memory validator. Not as thorough
     as KASAN, but it has unmeasurable overhead and is intended to be
     usable in production builds.

   - Everything else

  Subsystems affected by this patch series: alpha, procfs, sysctl,
  misc, core-kernel, MAINTAINERS, lib, bitops, checkpatch, init,
  coredump, seq_file, gdb, ubsan, initramfs, and mm (thp, cma,
  vmstat, memory-hotplug, mlock, rmap, zswap, zsmalloc, cleanups,
  kfence, kasan2, and pagemap2)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (118 commits)
  MIPS: make userspace mapping young by default
  initramfs: panic with memory information
  ubsan: remove overflow checks
  kgdb: fix to kill breakpoints on initmem after boot
  scripts/gdb: fix list_for_each
  x86: fix seq_file iteration for pat/memtype.c
  seq_file: document how per-entry resources are managed.
  fs/coredump: use kmap_local_page()
  init/Kconfig: fix a typo in CC_VERSION_TEXT help text
  init: clean up early_param_on_off() macro
  init/version.c: remove Version_<LINUX_VERSION_CODE> symbol
  checkpatch: do not apply "initialise globals to 0" check to BPF progs
  checkpatch: don't warn about colon termination in linker scripts
  checkpatch: add kmalloc_array_node to unnecessary OOM message check
  checkpatch: add warning for avoiding .L prefix symbols in assembly files
  checkpatch: improve TYPECAST_INT_CONSTANT test message
  checkpatch: prefer ftrace over function entry/exit printks
  checkpatch: trivial style fixes
  checkpatch: ignore warning designated initializers using NR_CPUS
  checkpatch: improve blank line after declaration test
  ...

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/kfence.h b/arch/arm64/include/asm/kfence.h
new file mode 100644
index 000000000000..d061176d57ea
--- /dev/null
+++ b/arch/arm64/include/asm/kfence.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arm64 KFENCE support.
+ *
+ * Copyright (C) 2020, Google LLC.
+ */
+
+#ifndef __ASM_KFENCE_H
+#define __ASM_KFENCE_H
+
+#include <asm/cacheflush.h>
+
+static inline bool arch_kfence_init_pool(void) { return true; }
+
+static inline bool kfence_protect_page(unsigned long addr, bool protect)
+{
+	set_memory_valid(addr, 1, !protect);
+
+	return true;
+}
+
+#endif /* __ASM_KFENCE_H */