msm_otg: hack to allow externally powered usb host mode
net: flow: Prevent bringing up new CPUs during per-CPU initialization

In a rare race-condition, it's possible that a CPU will be brought
online between when the for_each_online_cpu() loop executes to
call flow_cache_cpu_prepare(), and when the hotplug notifier for
calling this same function is registered. If this happens,
flow_cache_cpu_prepare() will never be called for the new CPU,
resulting in crashes due to uninitialized per-cpu data.

Fix this by preventing CPUs from being added or removed during
this small but sensitive window.

Change-Id: Iafbbaa8a50e5c527392d130561874313720849d0
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
cpufreq: Manage only online cpus

cpufreq core doesn't manage offline cpus and if driver->init() has returned
mask including offline cpus, it may result in unwanted behavior by cpufreq core
or governors.

We need to get only online cpus in this mask. There are two places to fix this
mask, cpufreq core and cpufreq driver. It makes sense to do this at common place
and hence is done in core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
binfmt_elf.c: use get_random_int() to fix entropy depleting

Changes:
--------
v4->v3:
- s/random_stack_user()/get_atrandom_bytes()/
- Move this function to ahead of its use to avoid the predeclaration.

v3->v2:
- Tweak code comments of random_stack_user().
- Remove redundant bits mask and shift upon the random variable.

v2->v1:
- Fix random copy to check up buffer length that are not 4-byte multiples.

v3 can be found at:
http://www.spinics.net/lists/linux-fsdevel/msg59597.html
v2 can be found at:
http://www.spinics.net/lists/linux-fsdevel/msg59418.html
v1 can be found at:
http://www.spinics.net/lists/linux-fsdevel/msg59128.html

Thanks,
-Jeff

Entropy is quickly depleted under normal operations like ls(1), cat(1),
etc...  between 2.6.30 to current mainline, for instance:

$ cat /proc/sys/kernel/random/entropy_avail
3428
$ cat /proc/sys/kernel/random/entropy_avail
2911
$cat /proc/sys/kernel/random/entropy_avail
2620

We observed this problem has been occurring since 2.6.30 with
fs/binfmt_elf.c: create_elf_tables()->get_random_bytes(), introduced by
f06295b44c296c8f ("ELF: implement AT_RANDOM for glibc PRNG seeding").

/*
 * Generate 16 random bytes for userspace PRNG seeding.
 */
get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));

The patch introduces a wrapper around get_random_int() which has lower
overhead than calling get_random_bytes() directly.

With this patch applied:
$ cat /proc/sys/kernel/random/entropy_avail
2731
$ cat /proc/sys/kernel/random/entropy_avail
2802
$ cat /proc/sys/kernel/random/entropy_avail
2878

Analyzed by John Sobecki.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <aedilger@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnn@arndb.de>
Cc: John Sobecki <john.sobecki@oracle.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Jakub Jelinek <jakub@redhat.com>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
msm: mdm2: Decrease leakage before QSC power-up

Cleanup of IPC gpios for driver strength and toggle
AP2MDM_STATUS only after AP2MDM_KPD_PWR is toggled, this
will decrease the leakage from MSM to QSC before QSC
powering up.

CRs-Fixed: 460500
Change-Id: Iabfa34331b613dd66577e485572a809440cf5272
Signed-off-by: Taniya Das <tdas@codeaurora.org>

modified for Mako use

Signed-off-by: Paul Reioux <reioux@gmail.com>
sched: Implement smarter wake-affine logic

The wake-affine scheduler feature is currently always trying to pull
the wakee close to the waker. In theory this should be beneficial if
the waker's CPU caches hot data for the wakee, and it's also beneficial
in the extreme ping-pong high context switch rate case.

Testing shows it can benefit hackbench up to 15%.

However, the feature is somewhat blind, from which some workloads
such as pgbench suffer. It's also time-consuming algorithmically.

Testing shows it can damage pgbench up to 50% - far more than the
benefit it brings in the best case.

So wake-affine should be smarter and it should realize when to
stop its thankless effort at trying to find a suitable CPU to wake on.

This patch introduces 'wakee_flips', which will be increased each
time the task flips (switches) its wakee target.

So a high 'wakee_flips' value means the task has more than one
wakee, and the bigger the number, the higher the wakeup frequency.

Now when making the decision on whether to pull or not, pay attention to
the wakee with a high 'wakee_flips', pulling such a task may benefit
the wakee. Also imply that the waker will face cruel competition later,
it could be very cruel or very fast depends on the story behind
'wakee_flips', waker therefore suffers.

Furthermore, if waker also has a high 'wakee_flips', that implies that
multiple tasks rely on it, then waker's higher latency will damage all
of them, so pulling wakee seems to be a bad deal.

Thus, when 'waker->wakee_flips / wakee->wakee_flips' becomes
higher and higher, the cost of pulling seems to be worse and worse.

The patch therefore helps the wake-affine feature to stop its pulling
work when:

	wakee->wakee_flips > factor &&
	waker->wakee_flips > (factor * wakee->wakee_flips)
The 'factor' here is the number of CPUs in the current CPU's NUMA node,
so a bigger node will lead to more pulling since the trial becomes more
severe.

After applying the patch, pgbench shows up to 40% improvements and no regressions.

Tested with 12 cpu x86 server and tip 3.10.0-rc7.

The percentages in the final column highlight the areas with the biggest wins,
all other areas improved as well:

	pgbench		    base	smart

	| db_size | clients |  tps  |	|  tps  |
	+---------+---------+-------+   +-------+
	| 22 MB   |       1 | 10598 |   | 10796 |
	| 22 MB   |       2 | 21257 |   | 21336 |
	| 22 MB   |       4 | 41386 |   | 41622 |
	| 22 MB   |       8 | 51253 |   | 57932 |
	| 22 MB   |      12 | 48570 |   | 54000 |
	| 22 MB   |      16 | 46748 |   | 55982 | +19.75%
	| 22 MB   |      24 | 44346 |   | 55847 | +25.93%
	| 22 MB   |      32 | 43460 |   | 54614 | +25.66%
	| 7484 MB |       1 |  8951 |   |  9193 |
	| 7484 MB |       2 | 19233 |   | 19240 |
	| 7484 MB |       4 | 37239 |   | 37302 |
	| 7484 MB |       8 | 46087 |   | 50018 |
	| 7484 MB |      12 | 42054 |   | 48763 |
	| 7484 MB |      16 | 40765 |   | 51633 | +26.66%
	| 7484 MB |      24 | 37651 |   | 52377 | +39.11%
	| 7484 MB |      32 | 37056 |   | 51108 | +37.92%
	| 15 GB   |       1 |  8845 |   |  9104 |
	| 15 GB   |       2 | 19094 |   | 19162 |
	| 15 GB   |       4 | 36979 |   | 36983 |
	| 15 GB   |       8 | 46087 |   | 49977 |
	| 15 GB   |      12 | 41901 |   | 48591 |
	| 15 GB   |      16 | 40147 |   | 50651 | +26.16%
	| 15 GB   |      24 | 37250 |   | 52365 | +40.58%
	| 15 GB   |      32 | 36470 |   | 50015 | +37.14%
Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/51D50057.9000809@linux.vnet.ibm.com
[ Improved the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Signed-off-by: Paul Reioux <reioux@gmail.com>
sched: Micro-optimize the smart wake-affine logic

Smart wake-affine is using node-size as the factor currently, but the overhead
of the mask operation is high.

Thus, this patch introduce the 'sd_llc_size' percpu variable, which will record
the highest cache-share domain size, and make it to be the new factor, in order
to reduce the overhead and make it more reasonable.

Tested-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Link: http://lkml.kernel.org/r/51D5008E.6030102@linux.vnet.ibm.com
[ Tidied up the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Signed-off-by: Paul Reioux <reioux@gmail.com>
HACK: add sysfs interface to ziddey's MSM OTG hack for N4

(rebase)

this allows for normal / OTG Hack based on user sysfs command.
minor code clean up as well.

Signed-off-by: Paul Reioux <reioux@gmail.com>

HACK USB OTG: fix logic derp

Signed-off-by: Paul Reioux <reioux@gmail.com>
wireless: add VHT (802.11ac) definitions

Add the VHT definitions to be used by drivers supporting it.

Signed-off-by: Mahesh Palivela <maheshp@posedge.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: ce0e169529a2db1cd910d2d45a5713fcdc29f6e1
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: Iccbc9c8c1f0182c93d2476fd520d6d8070c5acdf
Signed-off-by: Jeff Johnson <jjohnson@codeaurora.org>
cfg80211: allow advertising VHT capabilities

Allow drivers to advertise their VHT capabilities
and export them to userspace via nl80211.

Signed-off-by: Mahesh Palivela <maheshp@posedge.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: bf0c111ec80355ee9fe2e2bdb609a536b54768d8
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I467d7a3386053eb23d92e5f3f4e4a92a8e01c95f
Signed-off-by: Jeff Johnson <jjohnson@codeaurora.org>
mac80211: include VHT capability IE in probe requests

Insert the VHT capability IE into probe requests.

Signed-off-by: Mahesh Palivela <maheshp@posedge.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: ba0afa2f22e1e3f332e45460f99328025d44564e
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[jjohnson@codeaurora.org: resolved 3.4 backport issues]
Change-Id: I3f9e19c85a76664abda65f4ef52672328ff31a0c
Signed-off-by: Jeff Johnson <jjohnson@codeaurora.org>
mac80211: VHT (11ac) association.

Insert VHT IEs into association frames to allow
mac80211 to connect as a VHT client.

Signed-off-by: Mahesh Palivela <maheshp@posedge.com>
[clarify commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: d545daba5357c1ca377a4fe917ccf4de3a3031e0
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[duttus@codeaurora.org: resolved 3.4 backport issues]
Change-Id: Idac8e490ad25636c7056101b9e8073830b74a783
Signed-off-by: Sunil Dutt <duttus@codeaurora.org>
ieee80211: Rename VHT cap struct

Rename struct ieee80211_vht_capabilities to ieee80211_vht_cap
and renamed its member vht_capabilities_info to vht_cap_info.

Signed-off-by: Mahesh Palivela <maheshp@posedge.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: d4950281d72d8845225e3a39dbeb366c40c824c9
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: Ib595d501a8049042f36640b5e8f0fa66ec8403f7
CRs-fixed: 452921
Signed-off-by: Jeff Johnson <jjohnson@codeaurora.org>
{nl,cfg}80211: Peer STA VHT caps

To save STAs VHT caps in AP mode

Signed-off-by: Mahesh Palivela <maheshp@posedge.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: f461be3eff662f01a177ecea8c1d7b040bb6bfbe
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[duttus@codeaurora.org: backport to 3.4 excluding the change in
net/mac80211/cfg.c-This commit includes the changes from following commits
in include/linux/nl80211.h and net/wireless/nl80211.c to compile for
msm-3.4.
89a54e48b9cbb44aed1bf6cd712e087b96b6ae65:
nl80211: prepare for non-netdev wireless devs.
57b5ce072e7361218a8e2ea1d62960cbb71d9cff:
cfg80211: add cellular base station regulatory hint support.
ed44a951c72ab409f932b1c15914488308e86da2:
cfg80211/nl80211: Notify connection request failure in AP mode.
e39e5b5e7206767a0f1be0e5cb7acbd0db87ae60:
cfg80211: Allow user space to specify non-IEs to SAE Authentication]
Change-Id: I6030c8c16a146eff7db426346c232a9b1f396951
Signed-off-by: Sunil Dutt <duttus@codeaurora.org>
cfg80211: Pass station (extended) capability info to kernel

The information of the peer's capabilities and extended capabilities are
required for the driver to perform TDLS Peer UAPSD operations and off
channel operations. This information of the peer is passed from user space
using NL80211_CMD_SET_STATION command. This commit enhances
the function nl80211_set_station to pass the capability information of
the peer to the driver.

Similarly, there may be need for capability information for other modes,
so allow this to be provided with both add_station and change_station.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 9d62a98617298c1da288f50e84c5dd67732e79b7
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I18b19ccdfdd2a6daca4fd5f878f9a8df2598a1e9
CRs-fixed: 452921
[duttus@codeaurora.org: backport to 3.4-This commit includes the
changes from following commits in include/linux/nl80211.h to compile
for msm-3.4.
ed47377154310fd2fd59d75fcdeb3d022344fb31 :
{nl,cfg}80211: add a flags word to scan requests.
3d9d1d6656a73ea8407734cfb00b81d14ef62d4b :
nl80211/cfg80211: support VHT channel configuration.
53cabad70ecf0c245b41285de64a74a6c3ee9933 :
nl80211: support P2P GO powersave configuration.
3b1c5a5307fb5277f395efdcf330c064d79df07d :
{cfg,nl}80211: mesh power mode primitives and userspace access.
77765eaf5cfb6b8dd98ec8b54b411d74ff6095f1 :
cfg80211/nl80211: add API for MAC address ACLs.
04f39047af2a6df64b763ea5a271db24879d0391 :
nl80211/cfg80211: add radar detection command/event.
a50df0c4c0d97170a6c43573612acacc43e62fe7 :
cfg80211: advertise extended capabilities to userspace.]
Signed-off-by: Sunil Dutt <duttus@codeaurora.org>
cfg80211: Pass TDLS peer's QoS/HT/VHT information during set_station

The information of the peer's capabilities is required for the driver
to perform TDLS Peer UAPSD operations. This information of the peer is
passed by the supplicant using NL80211_CMD_SET_STATION command. This
commit enhances the function nl80211_set_station to pass this
information of the peer to the driver in case this command is used
with the TDLS peer STA.

In addition, make the HT/VHT capability configuration handled more
consistently for other STA cases (reject both instead of just HT).

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: df881293c6ba9a12868491a717b25cb14ec1fa4a
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
CRs-fixed: 452921
Change-Id: Idf5c8e29de9c81e3fc6e9faf9ea785e9b505d89b
[duttus@codeaurora.org: resolved 3.4 backport issues]
Signed-off-by: Sunil Dutt <duttus@codeaurora.org>
cfg80211: fix station change if TDLS isn't supported

Larry noticed (and bisected) that commit df881293c6ba9a12868491a717b25
"cfg80211: Pass TDLS peer's QoS/HT/VHT information during set_station"
broke secure connections. This is is the case only for drivers that
don't support TDLS, where any kind of change, even just the change of
authorized flag that is required for normal operation, was rejected
now. To fix this, remove the checks. I have some patches that will add
proper verification for all the different cases later.

Cc: Jouni Malinen <j@w1.fi>
Bisected-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 8c6d59ee3509acd474365c34db291b950d2e66bf
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I6620b36c9c8b6304e21c44894d1295316fb7884b
CRs-fixed: 452921
Signed-off-by: Jeff Johnson <jjohnson@codeaurora.org>
cfg80211: Extend support for IEEE 802.11r Fast BSS Transition
cfg80211/nl80211: add API for MAC address ACLs

Add API to enable drivers to implement MAC address based
access control in AP/P2P GO mode. Capable drivers advertise
this capability by setting the maximum number of MAC
addresses in such a list in wiphy->max_acl_mac_addrs.

An initial ACL may be given to the NL80211_CMD_START_AP
command and/or changed later with NL80211_CMD_SET_MAC_ACL.

Black- and whitelists are supported, but not simultaneously.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
[rewrite commit log, many cleanups]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 77765eaf5cfb6b8dd98ec8b54b411d74ff6095f1
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
CRs-fixed: 487410
Change-Id: I9593b887941be5efa5e96546ad92cd6c6bf8fb87
[duttus@codeaurora.org: resolved 3.4 backport issues]
Signed-off-by: Sunil Dutt <duttus@codeaurora.org>
wcnss: Add API to expose the IRIS XO mode set

IRIS XO mode can be configured thru module parameter; and it can also
be auto detected. Add an API to expose the IRIS XO mode set. WLAN driver
can use this API for it's XO specific operation.

Change-Id: If40ae715f5e400e13a6fc9588d2bd144958ee8c2
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>