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, 40 insertions, 37 deletions

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 3a90a9e2b94a..963050c0283e 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -231,35 +231,36 @@ static bool unescape_special(char **src, char **dst)
  * @src:        source buffer (escaped)
  * @dst:        destination buffer (unescaped)
  * @size:       size of the destination buffer (0 to unlimit)
- * @flags:      combination of the flags (bitwise OR):
- *      %UNESCAPE_SPACE:
+ * @flags:      combination of the flags.
+ *
+ * Description:
+ * The function unquotes characters in the given string.
+ *
+ * Because the size of the output will be the same as or less than the size of
+ * the input, the transformation may be performed in place.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will always be NULL-terminated. Source string must be
+ * NULL-terminated as well.  The supported flags are::
+ *
+ *      UNESCAPE_SPACE:
  *              '\f' - form feed
  *              '\n' - new line
  *              '\r' - carriage return
  *              '\t' - horizontal tab
  *              '\v' - vertical tab
- *      %UNESCAPE_OCTAL:
+ *      UNESCAPE_OCTAL:
  *              '\NNN' - byte with octal value NNN (1 to 3 digits)
- *      %UNESCAPE_HEX:
+ *      UNESCAPE_HEX:
  *              '\xHH' - byte with hexadecimal value HH (1 to 2 digits)
- *      %UNESCAPE_SPECIAL:
+ *      UNESCAPE_SPECIAL:
  *              '\"' - double quote
  *              '\\' - backslash
  *              '\a' - alert (BEL)
  *              '\e' - escape
- *      %UNESCAPE_ANY:
+ *      UNESCAPE_ANY:
  *              all previous together
  *
- * Description:
- * The function unquotes characters in the given string.
- *
- * Because the size of the output will be the same as or less than the size of
- * the input, the transformation may be performed in place.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will always be NULL-terminated. Source string must be
- * NULL-terminated as well.
- *
  * Return:
  * The amount of the characters processed to the destination buffer excluding
  * trailing '\0' is returned.
@@ -441,7 +442,29 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
  * @isz:        source buffer size
  * @dst:        destination buffer (escaped)
  * @osz:        destination buffer size
- * @flags:      combination of the flags (bitwise OR):
+ * @flags:      combination of the flags
+ * @only:       NULL-terminated string containing characters used to limit
+ *              the selected escape class. If characters are included in @only
+ *              that would not normally be escaped by the classes selected
+ *              in @flags, they will be copied to @dst unescaped.
+ *
+ * Description:
+ * The process of escaping byte buffer includes several parts. They are applied
+ * in the following sequence.
+ *
+ *      1. The character is matched to the printable class, if asked, and in
+ *         case of match it passes through to the output.
+ *      2. The character is not matched to the one from @only string and thus
+ *         must go as-is to the output.
+ *      3. The character is checked if it falls into the class given by @flags.
+ *         %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
+ *         character. Note that they actually can't go together, otherwise
+ *         %ESCAPE_HEX will be ignored.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will not be NULL-terminated, thus caller have to append
+ * it if needs.   The supported flags are::
+ *
  *      %ESCAPE_SPACE: (special white space, not space itself)
  *              '\f' - form feed
  *              '\n' - new line
@@ -464,26 +487,6 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
  *              all previous together
  *      %ESCAPE_HEX:
  *              '\xHH' - byte with hexadecimal value HH (2 digits)
- * @only:       NULL-terminated string containing characters used to limit
- *              the selected escape class. If characters are included in @only
- *              that would not normally be escaped by the classes selected
- *              in @flags, they will be copied to @dst unescaped.
- *
- * Description:
- * The process of escaping byte buffer includes several parts. They are applied
- * in the following sequence.
- *      1. The character is matched to the printable class, if asked, and in
- *         case of match it passes through to the output.
- *      2. The character is not matched to the one from @only string and thus
- *         must go as-is to the output.
- *      3. The character is checked if it falls into the class given by @flags.
- *         %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
- *         character. Note that they actually can't go together, otherwise
- *         %ESCAPE_HEX will be ignored.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will not be NULL-terminated, thus caller have to append
- * it if needs.
  *
  * Return:
  * The total size of the escaped output that would be generated for