mm/swapfile.c: do not skip lowest_bit in scan_swap_map() scan loop

In the second half of scan_swap_map()'s scan loop, offset is set to
si->lowest_bit and then incremented before entering the loop for the
first time, causing si->swap_map[si->lowest_bit] to be skipped.

Signed-off-by: Jamie Liu <jamieliu@google.com>
Cc: Shaohua Li <shli@fusionio.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
ext4: remove unused ac_ex_scanned

When looking at a bug report with:

> kernel: EXT4-fs: 0 scanned, 0 found

I thought wow, 0 scanned, that's odd?  But it's not odd; it's printing
a variable that is initialized to 0 and never touched again.

It's never been used since the original merge, so I don't really even
know what the original intent was, either.

If anyone knows how to hook it up, speak now via patch, otherwise just
yank it so it's not making a confusing situation more confusing in
kernel logs.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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>
ext4: address a benign compiler warning

When !defined(CONFIG_EXT4_DEBUG), mb_debug() should be defined as a
no_printk() statement instead of an empty statement in order to suppress
the following compiler warning:

fs/ext4/mballoc.c: In function ‘ext4_mb_cleanup_pa’:
fs/ext4/mballoc.c:2659:47: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
   mb_debug(1, "mballoc: %u PAs left\n", count);

Signed-off-by: Patrick Palka <patrick@parcs.ath.cx>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
ext4: remove unreachable code in ext4_can_extents_be_merged()

Commit ec22ba8e ("ext4: disable merging of uninitialized extents")
ensured that if either extent under consideration is uninit, we
decline to merge, and immediately return.

But right after that test, we test again for an uninit
extent; we can never hit this.  So just remove the impossible
test and associated variable.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
ext4: remove unreachable code after ext4_can_extents_be_merged()

Commit ec22ba8e ("ext4: disable merging of uninitialized extents")
ensured that if either extent under consideration is uninit, we
decline to merge, and ext4_can_extents_be_merged() returns false.

So there is no need for the caller to then test whether the
extent under consideration is unitialized; if it were, we
wouldn't have gotten that far.

The comments were also inaccurate; ext4_can_extents_be_merged()
no longer XORs the states, it fails if *either* is uninit.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	fs/ext4/extents.c
Merge tag 'v3.4.89' into stock

This is the 3.4.89 stable release

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

Conflicts:
	drivers/usb/core/driver.c
	drivers/usb/host/xhci.c
Defconfig: 3.4.89

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

*But a simplified version of it compatible with the N5.  Full version was not made for this device.

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

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
binder: NULL pointer reference

This fix handles a possible NULL pointer reference in
debug message.

Signed-off-by: Paresh Nakhe <pnakhe@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
staging: android: lmk: check free memory when tasks switch to background

Add more free-memory check point.
This patch trigger low memory killer to scan free memory when a process is moved
to background task groups.

Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/557973
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
SLTApproved: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
staging: android: lmk: skip if killed by lmk

A task can be selected to kill when it's already exiting. Sending
signal to the task at that state won't set TIF_SIGPENDING for it.
After that, every task including threads in the exiting task itself
running into lmk will compete for the mutex, then spend some time
waiting for the exiting task to release memory or try to send signal
to the same task again.
We want the exiting task to exit as early as possible but it's slowed
down greatly by the mutex and waiting. Skip lmk if current thread
group leader is exiting and is killed by lmk. Also delegate TIF_MEMDIE
to current task.

Signed-off-by: Yuanyuan Zhong <zyy@motorola.com>
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Russell Knize <rknize@motorola.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	drivers/staging/android/lowmemorykiller.c
staging: android: lmk: check TIF directly

When trying to fix that lmk can't kill an exiting task
((CR) staging: android: lmk: skip if killed by lmk),
additional check was added for the TIF_MEMDIE flag.
However the task lock has already been taken when examining
the task. The same helper function which tries to grab the
task lock again will be deadlocked.
Change to check the thread flag of thread group leader directly.

Signed-off-by: Yuanyuan Zhong <zyy@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/587751
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
mm: vmscan: fix inappropriate zone congestion clearing

commit c702418f8a2f ("mm: vmscan: do not keep kswapd looping forever due
to individual uncompactable zones") removed zone watermark checks from
the compaction code in kswapd but left in the zone congestion clearing,
which now happens unconditionally on higher order reclaim.

This messes up the reclaim throttling logic for zones with
dirty/writeback pages, where zones should only lose their congestion
status when their watermarks have been restored.

Remove the clearing from the zone compaction section entirely.  The
preliminary zone check and the reclaim loop in kswapd will clear it if
the zone is considered balanced.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
msm: mdss: Turn off backlight while power off

Turn off the backlight while shut down panel as it
could show white flicker depending on the panel.

Change-Id: Ic5d4e97e70c87e5b6e956e27a766136610d6f345
Signed-off-by: Shuo Yan <shuoy@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
msm: kgsl: Do not detect faults when GPU core is idle

Do not detect GPU faults when GPU hardware status is idle,
this leads to incorrect fault detection.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/gpu/msm/adreno.h

Change-Id: I7a9f8c49eb819241698f99fd50aaed400aadd4f4
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
(cherry picked from commit 8002a0061d3ccfeccb93af50bce4ef44977845af)
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
bcmdhd: reducir wakelocks

Signed-off-by: flar2 <asegaert@gmail.com>