Firmware:Fix for compiling all other board versions
writeback: fix writeback cache thrashing

From: Namjae Jeon <namjae.jeon@samsung.com>

Consider Process A: huge I/O on sda
        doing heavy write operation - dirty memory becomes more
        than dirty_background_ratio
        on HDD - flusher thread flush-8:0

Consider Process B: small I/O on sdb
        doing while [1]; read 1024K + rewrite 1024K + sleep 2sec
        on Flash device - flusher thread flush-8:16

As Process A is a heavy dirtier, dirty memory becomes more
than dirty_background_thresh. Due to this, below check becomes
true(checking global_page_state in over_bground_thresh)
for all bdi devices(even for very small dirtied bdi - sdb):

In this case, even small cached data on 'sdb' is forced to flush
and writeback cache thrashing happens.

When we added debug prints inside above 'if' condition and ran
above Process A(heavy dirtier on bdi with flush-8:0) and
Process B(1024K frequent read/rewrite on bdi with flush-8:16)
we got below prints:

[Test setup: ARM dual core CPU, 512 MB RAM]

[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  56064 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  56704 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 84720 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 94720 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   384 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   960 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =    64 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 92160 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   256 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   768 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =    64 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   256 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   320 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =     0 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 92032 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 91968 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   192 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =  1024 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =    64 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   192 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   576 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =     0 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 84352 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   192 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =   512 KB
[over_bground_thresh]: wakeup flush-8:16 : BDI_RECLAIMABLE =     0 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 92608 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE = 92544 KB

As mentioned in above log, when global dirty memory > global background_thresh
small cached data is also forced to flush by flush-8:16.
If removing global background_thresh checking code, we can reduce cache
thrashing of frequently used small data.
And It will be great if we can reserve a portion of writeback cache using
min_ratio.

After applying patch:
$ echo 5 > /sys/block/sdb/bdi/min_ratio
$ cat /sys/block/sdb/bdi/min_ratio
5
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  56064 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  56704 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  84160 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  96960 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  94080 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  93120 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  93120 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  91520 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  89600 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  93696 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  93696 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  72960 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  90624 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  90624 KB
[over_bground_thresh]: wakeup flush-8:0 : BDI_RECLAIMABLE =  90688 KB

As mentioned in the above logs, once cache is reserved for Process B,
and patch is applied there is less writeback cache thrashing on sdb
by frequent forced writeback by flush-8:16 in over_bground_thresh.

After all, small cached data will be flushed by periodic writeback
once every dirty_writeback_interval.

Change-Id: Iad956fc192f704d77437d4c0683a4e7bb40b38cd
Suggested-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Vivek Trivedi <t.vivek@samsung.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
toolchain: linaro: Fix a bunch of warnings and errors

Change-Id: I74dc4a9a1c46a9d84d2a592d24a905b21aa87a15
toolchain: linaro: Fix a bunch of warnings and errors II

toolchain: linaro: fix uninitialized kbuf in sysctl.c for linaro optimizations

Change-Id: Idd983e621b67d4016ff113b18de8f8a59bc70c85

toolchain: linaro: fix warning subbuf.pages may be used uninitialized

Change-Id: I0aaa7ccb4a29ec58d7d05e24c19f22c8cc50c8cb

toolchain: linaro: fix ICE in fs/fs-writeback.c with gcc4.7

fs/fs-writeback.c: In function 'bdi_writeback_thread':
fs/fs-writeback.c:993:1: internal compiler error: in push_minipool_fix, at config/arm/arm.c:13180
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[1]: *** [fs/fs-writeback.o] Error 1
make: *** [fs] Error 2

$ arm-eabi-gcc -v
Using built-in specs.
COLLECT_GCC=/home/showp1984/WORK/toolchain/android-toolchain-eabi/bin/arm-eabi-gcc
COLLECT_LTO_WRAPPER=/home/showp1984/WORK/toolchain/android-toolchain-eabi/bin/../libexec/gcc/arm-eabi/4.7.2/lto-wrapper
Target: arm-eabi
Configured with: /mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-src/gcc-linaro-4.7-2012.09/configure --prefix=/tmp/android-toolchain-eabi --host=x86_64-linux-gnu --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-mpfr=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-mpc=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-cloog=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-ppl=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --disable-ppl-version-check --disable-cloog-version-check --enable-cloog-backend=isl --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --disable-libssp --disable-nls --disable-libmudflap --disable-shared --disable-sjlj-exceptions --disable-libquadmath --disable-libitm --disable-libatomic --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --prefix=/tmp/android-toolchain-eabi --disable-docs --disable-nls --with-gcc-version=linaro-4.7-2012.09 --with-binutils-version=2.23.51.0.3 --with-gmp-version=5.0.5 --with-mpfr-version=3.1.1 --with-mpc-version=1.0 --target=arm-eabi --enable-threads --enable-tls --disable-libgomp --disable-libstdc__-v3 --disable-libitm --disable-libatomic
Thread model: single
gcc version 4.7.2 20120910 (prerelease) (Linaro GCC 4.7-2012.09)

Change-Id: Ibf92c1f6d844368fe9da52315a975dc1928962a7
Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

toolchain: linaro: Fix a bunch of warnings and errors -O3

- Fixes a bunch of initiliazed vars
- Compile lib/bitmap.c with -Os due of a bug
  Reference: https://code.google.com/p/bricked/source/detail?repo=tenderloin&r=cb8b2fe72f43c5146cb340abb2026810e50a23fc
- Disable array-bounds warning on staging prima driver

Change-Id: If17b3db45d8494bb5b5f8e13b8e8478e4fc9b10f

toolchain: linaro: fix warning: 'it.task' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

toolchain: linaro: xc5000: fix warning 'quality' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

toolchain: linaro: fix warning 'kernel_dev' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

toolchain: linaro: fix 'warning: 'kernel_type' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

toolchain: linaro: xc5000: fix warning 'frame_lines' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

toolchain: linaro: l2cap_core: fix 'warning: '...' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

fix: kernel/auditsc.c:927:23: warning: 'state' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

drivers/media/common/tuners/xc5000: fix 'warning: 'lock_status' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

drivers/media/common/tuners/xc5000: fix 'warning: 'adc_envelope' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

drivers/media/common/tuners/xc4000: fix 'warning: '...' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

drivers/usb/host/ehci-sched: fix: 'warning: 'c_mask' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

fs/fuse/control: fix 'warning: 'val' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

fs/jbd2/journal: fix: 'warning: 'blocknr' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

net/unix/af_unix: fix: 'warning: '...' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
Makefile: add Linaro goddess optimizations
kernel/sysctl: fix: 'warning: 'kbuf' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:

	kernel/sysctl.c
kernel/sysctl: fix: 'warning: 'kbuf' may be used uninitialized in this function' #2

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:

	kernel/sysctl.c
kernel/workqueue.c: avoid array subscript above array boundaries

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:

	kernel/workqueue.c
fs/fs-writeback: This trace event causes a ICE in the mentioned compiler

$ arm-eabi-gcc -v
Using built-in specs.
COLLECT_GCC=arm-eabi-gcc
COLLECT_LTO_WRAPPER=/home/showp1984/WORK/toolchain/android-toolchain-eabi/bin/../libexec/gcc/arm-eabi/4.7.2/lto-wrapper
Target: arm-eabi
Configured with: /mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-src/gcc-linaro-4.7-2012.09/configure --prefix=/tmp/android-toolchain-eabi --host=x86_64-linux-gnu --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-mpfr=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-mpc=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-cloog=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --with-ppl=/mnt/jenkins/workspace/linaro-android_toolchain-4.7-2012.09/build/objdir/temp-install --disable-ppl-version-check --disable-cloog-version-check --enable-cloog-backend=isl --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --disable-libssp --disable-nls --disable-libmudflap --disable-shared --disable-sjlj-exceptions --disable-libquadmath --disable-libitm --disable-libatomic --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --prefix=/tmp/android-toolchain-eabi --disable-docs --disable-nls --with-gcc-version=linaro-4.7-2012.09 --with-binutils-version=2.23.51.0.3 --with-gmp-version=5.0.5 --with-mpfr-version=3.1.1 --with-mpc-version=1.0 --target=arm-eabi --enable-threads --enable-tls --disable-libgomp --disable-libstdc__-v3 --disable-libitm --disable-libatomic
Thread model: single
gcc version 4.7.2 20120910 (prerelease) (Linaro GCC 4.7-2012.09)

ICE:
  CC      fs/fs-writeback.o
fs/fs-writeback.c: In function 'bdi_writeback_thread':
fs/fs-writeback.c:685:1: internal compiler error: in push_minipool_fix, at config/arm/arm.c:13180
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[1]: *** [fs/fs-writeback.o] Error 1
make: *** [fs] Error 2

Since we don't need traces, just comment it out for now.

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
fs/jbd/journal: fix: 'warning: 'blocknr' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/char/msm_rotator: fix: 'warning: 'ps0_need' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/net/ppp/ppp_generic: fix: 'warning: 'code' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/power/pm8xxx-ccadc: fix: 'warning: 'ibat' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
drivers/power/pm8921-bms: fix: 'warning: 'vsense' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:
	drivers/power/pm8921-bms.c
fs/kernel: -O3 fixes

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:

	fs/namei.c
fix: drivers/net/usb/sierra_net.c: warning: 'hh.extmsgid.<U8114>.word' may be used uninitialized in this function

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
hub: fix various uninitialized variables

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
kernel/return_address.c: hide warning

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
Makefile: Added Snapdragon optimizations

Conflicts:

	Makefile

Conflicts:
	Makefile
Makefile: Optimizing build-options for linaro