lib/sha1: use the git implementation of SHA-1

For ChromiumOS, we use SHA-1 to verify the integrity of the root
filesystem.  The speed of the kernel sha-1 implementation has a major
impact on our boot performance.

To improve boot performance, we investigated using the heavily optimized
sha-1 implementation used in git.  With the git sha-1 implementation, we
see a 11.7% improvement in boot time.

10 reboots, remove slowest/fastest.

Before:

  Mean: 6.58 seconds Stdev: 0.14

After (with git sha-1, this patch):

  Mean: 5.89 seconds Stdev: 0.07

The other cool thing about the git SHA-1 implementation is that it only
needs 64 bytes of stack for the workspace while the original kernel
implementation needed 320 bytes.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Cc: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Cc: Nicolas Pitre <nico@cam.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Remove ARM SHA1 routines

Since commit c6cdf9c ("lib/sha1: use the git implementation of
SHA-1"), the ARM SHA1 routines no longer work.  The reason? They
depended on the larger 320-byte workspace, and now the sha1 workspace is
just 16 words (64 bytes).  So the assembly version would overwrite the
stack randomly.

The optimized asm version is also probably slower than the new improved
C version, so there's no reason to keep it around.  At least that was
the case in git, where what appears to be the same assembly language
version was removed two years ago because the optimized C BLK_SHA1 code
was faster.

Reported-and-tested-by: Joachim Eastwood <manabian@gmail.com>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Remove sha1.S

arm: remove stale export of 'sha_transform'

The generic library code already exports the generic function, this was
left-over from the ARM-specific version that just got removed.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
ARM: allow cpu-supported unaligned access
Sources:
https://github.com/Huexxx/lge-kernel-sniper/commit/8171fdcd687976ec68acbf229c0e5971c23523f4
https://bitbucket.org/EaglesBlood_Development/egb_tuna_kernel/src/1b739f424f00/arch/arm/include/asm/rwsem.h?at=master
defconfig: enable UACCESS_WITH_MEMCPY, disable SYNC & SW_SYNC, reverted HZ to 128
sync & sw_sync only cause lags sometimes, 256hz don't seem to be that much better at all.
decrease CPU transition latency to 15ms
tweaked deadline i/o sched for flash memory drives; set it as default
drivers/gpu/pvr/pvr_governor: add and enable PVR GPU governor
boype: left out the sysfs interface for current GPU frequency since we already have another one

this simple PVR GPU governor will scale between 3 speeds:
  idle -- GPU not active
  nominal -- GPU active with low graphical load
  turbo -- GPU active and boosted to max frequency

This should further save battery by intelligently selecting GPU frequency
based on GPU loading.

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

drivers/gpu/pvr/pvr_governor: add sysfs entry to switch governor type

0 - "performance" ==> always return system turbo speed
1 - "ondemand" ==> return based on GPU loading (by default "ondemand"
governor is active)

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

drivers/gpu/pvr/pvr_governor: add "powersave" governor as another option

    0 - "performance" ==> always return system turbo speed
    1 - "ondemand" ==> return based on GPU loading (by default "ondemand"
                       governor is active)
    2 - "powersave" ==> run alway at nominal speed

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

drivers/gpu/pvr/pvr_governor: fix sysfs to show "powersave" governor

Signed-off-by: Paul Reioux <reioux@gmail.com>
Adjust GPU OC and GPU governor interfaces to function properly with each other
Completely removed omap 4460 voltage dependencies
slightly increased voltage for 384 MHz GPU OPP
mm.h: decreased readahead kbytes to 768
Fancy Kernel r12