Logger: Merge Upstream stuff from N5

* Most importantly the ability to turn off this stupid thing

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Defconfig: Enable KALLYSYMS

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
ext4: avoid bh leak in retry path of ext4_expand_extra_isize_ea()

commit dcb9917ba041866686fe152850364826c4622a36 upstream.

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
ext4: fix use-after-free in ext4_mb_new_blocks

commit 4e8d2139802ce4f41936a687f06c560b12115247 upstream.

ext4_mb_put_pa should hold pa->pa_lock before accessing pa->pa_count.
While ext4_mb_use_preallocated checks pa->pa_deleted first and then
increments pa->count later, ext4_mb_put_pa decrements pa->pa_count
before holding pa->pa_lock and then sets pa->pa_deleted.

* Free sequence
ext4_mb_put_pa (1):		atomic_dec_and_test pa->pa_count
ext4_mb_put_pa (2):		lock pa->pa_lock
ext4_mb_put_pa (3):			check pa->pa_deleted
ext4_mb_put_pa (4):			set pa->pa_deleted=1
ext4_mb_put_pa (5):		unlock pa->pa_lock
ext4_mb_put_pa (6):		remove pa from a list
ext4_mb_pa_callback:		free pa

* Use sequence
ext4_mb_use_preallocated (1):	iterate over preallocation
ext4_mb_use_preallocated (2):	lock pa->pa_lock
ext4_mb_use_preallocated (3):		check pa->pa_deleted
ext4_mb_use_preallocated (4):		increase pa->pa_count
ext4_mb_use_preallocated (5):	unlock pa->pa_lock
ext4_mb_release_context:	access pa

* Use-after-free sequence
[initial status]		<pa->pa_deleted = 0, pa_count = 1>
ext4_mb_use_preallocated (1):	iterate over preallocation
ext4_mb_use_preallocated (2):	lock pa->pa_lock
ext4_mb_use_preallocated (3):		check pa->pa_deleted
ext4_mb_put_pa (1):		atomic_dec_and_test pa->pa_count
[pa_count decremented]		<pa->pa_deleted = 0, pa_count = 0>
ext4_mb_use_preallocated (4):		increase pa->pa_count
[pa_count incremented]		<pa->pa_deleted = 0, pa_count = 1>
ext4_mb_use_preallocated (5):	unlock pa->pa_lock
ext4_mb_put_pa (2):		lock pa->pa_lock
ext4_mb_put_pa (3):			check pa->pa_deleted
ext4_mb_put_pa (4):			set pa->pa_deleted=1
[race condition!]		<pa->pa_deleted = 1, pa_count = 1>
ext4_mb_put_pa (5):		unlock pa->pa_lock
ext4_mb_put_pa (6):		remove pa from a list
ext4_mb_pa_callback:		free pa
ext4_mb_release_context:	access pa

AddressSanitizer has detected use-after-free in ext4_mb_new_blocks
Bug report: http://goo.gl/rG1On3

Signed-off-by: Junho Ryu <jayr@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
ext4: don't calculate total xattr header size unless needed

The function ext4_expand_extra_isize_ea() doesn't need the size of all
of the extended attribute headers.  So if we don't calculate it when
it is unneeded, it we can skip some undeeded memory references, and as
a bonus, we eliminate some kvetching by static code analysis tools.

Addresses-Coverity-Id: #741291

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
writeback: Fix occasional slow sync(1)

In case when system contains no dirty pages, wakeup_flusher_threads()
will submit WB_SYNC_NONE writeback for 0 pages so wb_writeback() exits
immediately without doing anything. Thus sync(1) will write all the
dirty inodes from a WB_SYNC_ALL writeback pass which is slow.

Fix the problem by using get_nr_dirty_pages() in
wakeup_flusher_threads() instead of calculating number of dirty pages
manually. That function also takes number of dirty inodes into account.

CC: stable@vger.kernel.org
Reported-by: Paul Taysom <taysom@chromium.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Cristoforo Cataldo <cristoforo.cataldo@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Revert "Make Fsync Configurable"

This reverts commit a22f8ebbd4d27c3dce87ae4bfd76775561c37fac.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	fs/sync.c
Revert "Revert "Make Fsync Configurable""

This reverts commit 5b2ace9e35f2156ebafd8d2d08783e326d6756f6.
Drop GPU

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
hercules: Disable 2D GPU

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
hercules: Fix up ACPU

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
cpufreq: Introduce CPU-boost framework

The CPU-boost framework allows you to place hooks in various drivers to boost the CPU for either a specified duration or indefinitely (until it is manually unboosted). If a new boost request is sent while the CPU is boosted then the new boost request will take precedence and immediately override the current boost.

Signed-off-by: Sultanxda <sultanxda@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Add initial CPU-boost hooks

CPU is currently boosted for these activities:
*Taking a picture (1188MHz for 3s)
*Starting video playback (1242MHz for 5s)
*Recording video (594MHz indefinite)
*Turning on the display (972MHz for 7s)

Signed-off-by: Sultanxda <sultanxda@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
cpu_boost: Respect max frequency

If the requested boost frequency is greater than the maxfreq then reduce the boost to 2 steps below the current maxfreq (108MHz below the current maxfreq). If the maxfreq is 486MHz or lower then the boost will be canceled.

Signed-off-by: Sultanxda <sultanxda@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
msm8x60_celox: Add CPU-boost hook in ts power-on sequence

The touchscreen is powered on roughly 100ms before the panel is powered on. This gives us an extra 100ms of earlier boosting when waking the device from sleep.

Signed-off-by: Sultanxda <sultanxda@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
cpu_boost: Add sysfs interface

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
hercules: Enable CPU Boost

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
sweep2wake: Add sensitive option

This is for users (like myself) who feel like the current s2w is too tedious/precise to trigger. This option, when enabled only requires the 1st and last button to be triggered making it easier to initiate with a thumb or without making full contact & discontact with all 4 buttons.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
selinux: add a ugly workaround to bail early when selinux tries to free a socket that is still in use and it ends in a Kernel panic. These lines are from opensource.samsung.com. While this will most likely put a bandaid over this Kernel panic it does not fix the bug so it might occur somewhere else if the same conditions are met but since I have only seen panics from this hook then we may as well sleep in peace.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
SELinux: Reduce overhead of mls_level_isvalid() function call

Date	Mon, 10 Jun 2013 13:55:08 -0400

v4->v5:
  - Fix scripts/checkpatch.pl warning.

v3->v4:
  - Merge the 2 separate while loops in ebitmap_contains() into
    a single one.

v2->v3:
  - Remove unused local variables i, node from mls_level_isvalid().

v1->v2:
 - Move the new ebitmap comparison logic from mls_level_isvalid()
   into the ebitmap_contains() helper function.
 - Rerun perf and performance tests on the latest v3.10-rc4 kernel.

While running the high_systime workload of the AIM7 benchmark on
a 2-socket 12-core Westmere x86-64 machine running 3.10-rc4 kernel
(with HT on), it was found that a pretty sizable amount of time was
spent in the SELinux code. Below was the perf trace of the "perf
record -a -s" of a test run at 1500 users:

  5.04%            ls  [kernel.kallsyms]     [k] ebitmap_get_bit
  1.96%            ls  [kernel.kallsyms]     [k] mls_level_isvalid
  1.95%            ls  [kernel.kallsyms]     [k] find_next_bit

The ebitmap_get_bit() was the hottest function in the perf-report
output.  Both the ebitmap_get_bit() and find_next_bit() functions
were, in fact, called by mls_level_isvalid(). As a result, the
mls_level_isvalid() call consumed 8.95% of the total CPU time of
all the 24 virtual CPUs which is quite a lot. The majority of the
mls_level_isvalid() function invocations come from the socket creation
system call.

Looking at the mls_level_isvalid() function, it is checking to see
if all the bits set in one of the ebitmap structure are also set in
another one as well as the highest set bit is no bigger than the one
specified by the given policydb data structure. It is doing it in
a bit-by-bit manner. So if the ebitmap structure has many bits set,
the iteration loop will be done many times.

The current code can be rewritten to use a similar algorithm as the
ebitmap_contains() function with an additional check for the
highest set bit. The ebitmap_contains() function was extended to
cover an optional additional check for the highest set bit, and the
mls_level_isvalid() function was modified to call ebitmap_contains().

With that change, the perf trace showed that the used CPU time drop
down to just 0.08% (ebitmap_contains + mls_level_isvalid) of the
total which is about 100X less than before.

  0.07%            ls  [kernel.kallsyms]     [k] ebitmap_contains
  0.05%            ls  [kernel.kallsyms]     [k] ebitmap_get_bit
  0.01%            ls  [kernel.kallsyms]     [k] mls_level_isvalid
  0.01%            ls  [kernel.kallsyms]     [k] find_next_bit

The remaining ebitmap_get_bit() and find_next_bit() functions calls
are made by other kernel routines as the new mls_level_isvalid()
function will not call them anymore.

This patch also improves the high_systime AIM7 benchmark result,
though the improvement is not as impressive as is suggested by the
reduction in CPU time spent in the ebitmap functions. The table below
shows the performance change on the 2-socket x86-64 system (with HT
on) mentioned above.

+--------------+---------------+----------------+-----------------+
|   Workload   | mean % change | mean % change  | mean % change   |
|              | 10-100 users  | 200-1000 users | 1100-2000 users |
+--------------+---------------+----------------+-----------------+
| high_systime |     +0.1%     |     +0.9%      |     +2.6%       |
+--------------+---------------+----------------+-----------------+
Signed-off-by: Waiman Long <Waiman.Long@hp.com>
Signed-off-by: Paul Reioux <reioux@gmail.com>

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>