add HOW_TO_BUILD
update sio,vr iosched
suport j4fs
update build script
add cpu governors
do not disable TMPFS when TINY_SHMEM is selected
crc32c: Implement CRC32c with slicing-by-8 algorithm

The existing CRC32c implementation uses Sarwate's algorithm to calculate the
code one byte at a time.  Using a slicing-by-8 algorithm adapted from Bob
Pearson, we can process buffers 8 bytes at a time, for a substantial increase
in performance.

The motivation for this patchset is that I am working on adding full metadata
checksumming to ext4 and jbd2.  As far as performance impact of adding
checksumming goes, I see nearly no change with a standard mail server ffsb
simulation.  On a test that involves only metadata operations (file creation
and deletion, and fallocate/truncate), I see a drop of about 50 pcercent with
the current kernel crc32c implementation; this improves to a drop of about 20
percent with the enclosed crc32c code.

When metadata is usually a small fraction of total IO, this new implementation
doesn't help much because metadata is usually a small fraction of total IO.
However, when we are doing IO that is almost all metadata (such as rm -rf'ing a
tree), then this patch speeds up the operation substantially.

Given that iscsi, sctp, and btrfs also use crc32c, this patchset should improve
their speed as well.  I have some preliminary results[1] that show the
difference in various crc algorithms that I've come across: the "crc32c-by8-le"
column is the new algorithm in the patch; the "crc32c" column is the current
crc32c kernel implementation; and the "crc32-kern-le" column is the current
crc32 kernel implementation, which is similar to the results one gets for
CONFIG_CRC32C_SLICEBY4=y.  As you can see, the new implementation runs at
nearly 4x the speed of the current implementation; even the slimmer slice-by-4
implementation is generally 2-3x faster.
However, the implementation allows the kernel builder to select from a variety
of space-speed tradeoffs, should my results not hold true on a particular
class of system.

v2: Use the crypto testmgr api for self-test.
v3: Get rid of the -be version, which had no users.
v4: Allow kernel builder a choice of speed vs. space optimization.

[1]http://djwong.org/docs/ext4_metadata_checksums.html
(cached copy of the ext4 wiki)

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
fix duplicate export sha_transform
arm: vfp: set CFLAG to neon
Added -mtune=cortex-a9 to KBUILD_CFLAGS
RCU: Joe's RCU

Forward port jRCU to linux-3.0.

Thanks goes to Francisco Franco for his help
in testing out this version on the Android
Galaxy Nexus phone.

Signed-off-by: Joe Korty <joe.korty@ccur.com>
update defconfig
Makefile: add CFLAGS -mfpu=neon -march=armv7-a
cpufreq: update ondemand gov
cpufreq: update conservative gov
cpufreq: update interactive gov
cpufreq: Add global min&max_suspend frequency variables
kernel:Add CGROUP_TIMER_SLACK
Add voodoo multipliers stuff

Full code based on Supercurio Stuff for Crespo
Credits also for Ezekeel since he is the first to port this to GN
ram_console: set CON_ANYTIME console flag

We want to ensure that we get all the console messages, even ones
that occur while the printing CPU is not yet online.

Change-Id: I1d2694d05ac9415669a92f38efdd8e71c927705b
Signed-off-by: Dima Zavin <dima@android.com>