Merge branch 'akpm' (patches from Andrew)

Merge second patchbomb from Andrew Morton:

 - most of the rest of MM

 - lots of misc things

 - procfs updates

 - printk feature work

 - updates to get_maintainer, MAINTAINERS, checkpatch

 - lib/ updates

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (96 commits)
  exit,stats: /* obey this comment */
  coredump: add __printf attribute to cn_*printf functions
  coredump: use from_kuid/kgid when formatting corename
  fs/reiserfs: remove unneeded cast
  NILFS2: support NFSv2 export
  fs/befs/btree.c: remove unneeded initializations
  fs/minix: remove unneeded cast
  init/do_mounts.c: add create_dev() failure log
  kasan: remove duplicate definition of the macro KASAN_FREE_PAGE
  fs/efs: femove unneeded cast
  checkpatch: emit "NOTE: <types>" message only once after multiple files
  checkpatch: emit an error when there's a diff in a changelog
  checkpatch: validate MODULE_LICENSE content
  checkpatch: add multi-line handling for PREFER_ETHER_ADDR_COPY
  checkpatch: suggest using eth_zero_addr() and eth_broadcast_addr()
  checkpatch: fix processing of MEMSET issues
  checkpatch: suggest using ether_addr_equal*()
  checkpatch: avoid NOT_UNIFIED_DIFF errors on cover-letter.patch files
  checkpatch: remove local from codespell path
  checkpatch: add --showfile to allow input via pipe to show filenames
  ...

9 files changed, 117 insertions, 18 deletions

diff --git a/Documentation/ABI/testing/configfs-spear-pcie-gadget b/Documentation/ABI/testing/configfs-spear-pcie-gadget
index 875988146a63..840c324ef34d 100644
--- a/Documentation/ABI/testing/configfs-spear-pcie-gadget
+++ b/Documentation/ABI/testing/configfs-spear-pcie-gadget
@@ -1,7 +1,7 @@
 What:		/config/pcie-gadget
 Date:		Feb 2011
 KernelVersion:	2.6.37
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 
 	Interface is used to configure selected dual mode PCIe controller
diff --git a/Documentation/ABI/testing/dev-kmsg b/Documentation/ABI/testing/dev-kmsg
index bb820be48179..fff817efa508 100644
--- a/Documentation/ABI/testing/dev-kmsg
+++ b/Documentation/ABI/testing/dev-kmsg
@@ -98,4 +98,13 @@ Description:	The /dev/kmsg character device node provides userspace access
 		logic is used internally when messages are printed to the
 		console, /proc/kmsg or the syslog() syscall.
 
+		By default, kernel tries to avoid fragments by concatenating
+		when it can and fragments are rare; however, when extended
+		console support is enabled, the in-kernel concatenation is
+		disabled and /dev/kmsg output will contain more fragments. If
+		the log consumer performs concatenation, the end result
+		should be the same. In the future, the in-kernel concatenation
+		may be removed entirely and /dev/kmsg users are recommended to
+		implement fragment handling.
+
 Users:		dmesg(1), userspace kernel log consumers
diff --git a/Documentation/ABI/testing/sysfs-bus-usb-lvstest b/Documentation/ABI/testing/sysfs-bus-usb-lvstest
index aae68fc2d842..5151290cf8e7 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb-lvstest
+++ b/Documentation/ABI/testing/sysfs-bus-usb-lvstest
@@ -4,14 +4,14 @@ driver is bound with root hub device.
 
 What:		/sys/bus/usb/devices/.../get_dev_desc
 Date:		March 2014
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 		Write to this node to issue "Get Device Descriptor"
 		for Link Layer Validation device. It is needed for TD.7.06.
 
 What:		/sys/bus/usb/devices/.../u1_timeout
 Date:		March 2014
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 		Set "U1 timeout" for the downstream port where Link Layer
 		Validation device is connected. Timeout value must be between 0
@@ -19,7 +19,7 @@ Description:
 
 What:		/sys/bus/usb/devices/.../u2_timeout
 Date:		March 2014
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 		Set "U2 timeout" for the downstream port where Link Layer
 		Validation device is connected. Timeout value must be between 0
@@ -27,21 +27,21 @@ Description:
 
 What:		/sys/bus/usb/devices/.../hot_reset
 Date:		March 2014
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 		Write to this node to issue "Reset" for Link Layer Validation
 		device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.
 
 What:		/sys/bus/usb/devices/.../u3_entry
 Date:		March 2014
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 		Write to this node to issue "U3 entry" for Link Layer
 		Validation device. It is needed for TD.7.35 and TD.7.36.
 
 What:		/sys/bus/usb/devices/.../u3_exit
 Date:		March 2014
-Contact:	Pratyush Anand <pratyush.anand@st.com>
+Contact:	Pratyush Anand <pratyush.anand@gmail.com>
 Description:
 		Write to this node to issue "U3 exit" for Link Layer
 		Validation device. It is needed for TD.7.36.
diff --git a/Documentation/ABI/testing/sysfs-class-zram b/Documentation/ABI/testing/sysfs-class-zram
new file mode 100644
index 000000000000..48ddacbe0e69
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-zram
@@ -0,0 +1,24 @@
+What:		/sys/class/zram-control/
+Date:		August 2015
+KernelVersion:	4.2
+Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
+Description:
+		The zram-control/ class sub-directory belongs to zram
+		device class
+
+What:		/sys/class/zram-control/hot_add
+Date:		August 2015
+KernelVersion:	4.2
+Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
+Description:
+		RO attribute. Read operation will cause zram to add a new
+		device and return its device id back to user (so one can
+		use /dev/zram<id>), or error code.
+
+What:		/sys/class/zram-control/hot_remove
+Date:		August 2015
+KernelVersion:	4.2
+Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
+Description:
+		WO attribute. Remove a specific /dev/zramX device, where X
+		is a device_id provided by user.
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 48a183e29988..c4de576093af 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -19,7 +19,9 @@ Following shows a typical sequence of steps for using zram.
 1) Load Module:
 	modprobe zram num_devices=4
 	This creates 4 devices: /dev/zram{0,1,2,3}
-	(num_devices parameter is optional. Default: 1)
+
+num_devices parameter is optional and tells zram how many devices should be
+pre-created. Default: 1.
 
 2) Set max number of compression streams
 	Compression backend may use up to max_comp_streams compression streams,
@@ -97,7 +99,24 @@ size of the disk when not in use so a huge zram is wasteful.
 	mkfs.ext4 /dev/zram1
 	mount /dev/zram1 /tmp
 
-7) Stats:
+7) Add/remove zram devices
+
+zram provides a control interface, which enables dynamic (on-demand) device
+addition and removal.
+
+In order to add a new /dev/zramX device, perform read operation on hot_add
+attribute. This will return either new device's device id (meaning that you
+can use /dev/zram<id>) or error code.
+
+Example:
+	cat /sys/class/zram-control/hot_add
+	1
+
+To remove the existing /dev/zramX device (where X is a device id)
+execute
+	echo X > /sys/class/zram-control/hot_remove
+
+8) Stats:
 Per-device statistics are exported as various nodes under /sys/block/zram<id>/
 
 A brief description of exported device attritbutes. For more details please
@@ -126,7 +145,7 @@ mem_used_max      RW    the maximum amount memory zram have consumed to
 mem_limit         RW    the maximum amount of memory ZRAM can use to store
                         the compressed data
 num_migrated      RO    the number of objects migrated migrated by compaction
-
+compact           WO    trigger memory compaction
 
 WARNING
 =======
@@ -172,11 +191,11 @@ line of text and contains the following stats separated by whitespace:
 	zero_pages
 	num_migrated
 
-8) Deactivate:
+9) Deactivate:
 	swapoff /dev/zram0
 	umount /dev/zram1
 
-9) Reset:
+10) Reset:
 	Write any positive value to 'reset' sysfs node
 	echo 1 > /sys/block/zram0/reset
 	echo 1 > /sys/block/zram1/reset
diff --git a/Documentation/misc-devices/spear-pcie-gadget.txt b/Documentation/misc-devices/spear-pcie-gadget.txt
index 02c13ef5e908..89b88dee4143 100644
--- a/Documentation/misc-devices/spear-pcie-gadget.txt
+++ b/Documentation/misc-devices/spear-pcie-gadget.txt
@@ -2,7 +2,7 @@ Spear PCIe Gadget Driver:
 
 Author
 =============
-Pratyush Anand (pratyush.anand@st.com)
+Pratyush Anand (pratyush.anand@gmail.com)
 
 Location
 ============
diff --git a/Documentation/networking/netconsole.txt b/Documentation/networking/netconsole.txt
index a5d574a9ae09..30409a36e95d 100644
--- a/Documentation/networking/netconsole.txt
+++ b/Documentation/networking/netconsole.txt
@@ -2,6 +2,7 @@
 started by Ingo Molnar <mingo@redhat.com>, 2001.09.17
 2.6 port and netpoll api by Matt Mackall <mpm@selenic.com>, Sep 9 2003
 IPv6 support by Cong Wang <xiyou.wangcong@gmail.com>, Jan 1 2013
+Extended console support by Tejun Heo <tj@kernel.org>, May 1 2015
 
 Please send bug reports to Matt Mackall <mpm@selenic.com>
 Satyam Sharma <satyam.sharma@gmail.com>, and Cong Wang <xiyou.wangcong@gmail.com>
@@ -24,9 +25,10 @@ Sender and receiver configuration:
 It takes a string configuration parameter "netconsole" in the
 following format:
 
- netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
+ netconsole=[+][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
 
    where
+        +             if present, enable extended console support
         src-port      source for UDP packets (defaults to 6665)
         src-ip        source IP to use (interface address)
         dev           network interface (eth0)
@@ -107,6 +109,7 @@ To remove a target:
 The interface exposes these parameters of a netconsole target to userspace:
 
 	enabled		Is this target currently enabled?	(read-write)
+	extended	Extended mode enabled			(read-write)
 	dev_name	Local network interface name		(read-write)
 	local_port	Source UDP port to use			(read-write)
 	remote_port	Remote agent's UDP port			(read-write)
@@ -132,6 +135,36 @@ You can also update the local interface dynamically. This is especially
 useful if you want to use interfaces that have newly come up (and may not
 have existed when netconsole was loaded / initialized).
 
+Extended console:
+=================
+
+If '+' is prefixed to the configuration line or "extended" config file
+is set to 1, extended console support is enabled. An example boot
+param follows.
+
+ linux netconsole=+4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc
+
+Log messages are transmitted with extended metadata header in the
+following format which is the same as /dev/kmsg.
+
+ <level>,<sequnum>,<timestamp>,<contflag>;<message text>
+
+Non printable characters in <message text> are escaped using "\xff"
+notation. If the message contains optional dictionary, verbatim
+newline is used as the delimeter.
+
+If a message doesn't fit in certain number of bytes (currently 1000),
+the message is split into multiple fragments by netconsole. These
+fragments are transmitted with "ncfrag" header field added.
+
+ ncfrag=<byte-offset>/<total-bytes>
+
+For example, assuming a lot smaller chunk size, a message "the first
+chunk, the 2nd chunk." may be split as follows.
+
+ 6,416,1758426,-,ncfrag=0/31;the first chunk,
+ 6,416,1758426,-,ncfrag=16/31; the 2nd chunk.
+
 Miscellaneous notes:
 ====================
 
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index e5d528e0c46e..6fccb69c03e7 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -197,8 +197,8 @@ core_pattern is used to specify a core dumpfile pattern name.
 	%P	global pid (init PID namespace)
 	%i	tid
 	%I	global tid (init PID namespace)
-	%u	uid
-	%g	gid
+	%u	uid (in initial user namespace)
+	%g	gid (in initial user namespace)
 	%d	dump mode, matches PR_SET_DUMPABLE and
 		/proc/sys/fs/suid_dumpable
 	%s	signal number
diff --git a/Documentation/vm/zswap.txt b/Documentation/vm/zswap.txt
index 00c3d31e7971..8458c0861e4e 100644
--- a/Documentation/vm/zswap.txt
+++ b/Documentation/vm/zswap.txt
@@ -26,8 +26,22 @@ Zswap evicts pages from compressed cache on an LRU basis to the backing swap
 device when the compressed pool reaches its size limit.  This requirement had
 been identified in prior community discussions.
 
-To enabled zswap, the "enabled" attribute must be set to 1 at boot time.  e.g.
-zswap.enabled=1
+Zswap is disabled by default but can be enabled at boot time by setting
+the "enabled" attribute to 1 at boot time. ie: zswap.enabled=1.  Zswap
+can also be enabled and disabled at runtime using the sysfs interface.
+An example command to enable zswap at runtime, assuming sysfs is mounted
+at /sys, is:
+
+echo 1 > /sys/modules/zswap/parameters/enabled
+
+When zswap is disabled at runtime it will stop storing pages that are
+being swapped out.  However, it will _not_ immediately write out or fault
+back into memory all of the pages stored in the compressed pool.  The
+pages stored in zswap will remain in the compressed pool until they are
+either invalidated or faulted back into memory.  In order to force all
+pages out of the compressed pool, a swapoff on the swap device(s) will
+fault back into memory all swapped out pages, including those in the
+compressed pool.
 
 Design: