ARM: add support for kernel mode NEON

In order to safely support the use of NEON instructions in
kernel mode, some precautions need to be taken:
- the userland context that may be present in the registers (even
  if the NEON/VFP is currently disabled) must be stored under the
  correct task (which may not be 'current' in the UP case),
- to avoid having to keep track of additional vfpstates for the
  kernel side, disallow the use of NEON in interrupt context
  and run with preemption disabled,
- after use, re-enable preemption and re-enable the lazy restore
  machinery by disabling the NEON/VFP unit.

This patch adds the functions kernel_neon_begin() and
kernel_neon_end() which take care of the above. It also adds
the Kconfig symbol KERNEL_MODE_NEON to enable it.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>

Conflicts:
	arch/arm/vfp/vfpmodule.c
ARM: crypto: add NEON accelerated XOR implementation

Add a source file xor-neon.c (which is really just the reference
C implementation passed through the GCC vectorizer) and hook it
up to the XOR framework.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
arm: Allow CPU-supported unaligned accesses
This change reconfigures the CPU to allow CPU-supported unaligned
accesses, which are generally faster than software-only fixups,
resulting in fewer alignment exceptions.

Signed-off-by: Brent DeGraaf <bdegraaf@codeaurora.org>

Conflicts:
	arch/arm/configs/cm_fusion3_yuga_defconfig
crypto: arc4 - improve performance by adding ecb(arc4)

Currently arc4.c provides simple one-byte blocksize cipher which is wrapped
by ecb() module, giving function call overhead on every encrypted byte. This
patch adds ecb(arc4) directly into arc4.c for higher performance.

tcrypt results (speed ratios: new/old):

AMD Phenom II, x86-64 : x2.7
Intel Core 2, x86-64  : x1.9
Intel Atom N260, i386 : x1.4

Cc: Jon Oberheide <jon@oberheide.org>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto: arc4 - improve performance by using u32 for ctx and variables

This patch changes u8 in struct arc4_ctx and variables to u32 (as AMD seems
to have problem with u8 array). Below are tcrypt results of old 1-byte block
cipher versus ecb(arc4) with u8 and ecb(arc4) with u32.

tcrypt results, x86-64 (speed ratios: new-u32/old, new-u8/old):

                  u32    u8
AMD Phenom II   : x3.6   x2.7
Intel Core 2    : x2.0   x1.9

tcrypt results, i386 (speed ratios: new-u32/old, new-u8/old):

                  u32    u8
Intel Atom N260 : x1.5   x1.4

Cc: Jon Oberheide <jon@oberheide.org>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto: arc4 - now arc needs blockcipher support

Since commit ce6dd368 ("crypto: arc4 - improve performance by adding
ecb(arc4)) we need to pull in a blkcipher.

|ERROR: "crypto_blkcipher_type" [crypto/arc4.ko] undefined!
|ERROR: "blkcipher_walk_done" [crypto/arc4.ko] undefined!
|ERROR: "blkcipher_walk_virt" [crypto/arc4.ko] undefined!

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
memutils

Conflicts:
	Makefile
fastcharge

Conflicts:
	Makefile
	boot.img
	zImage
drivers/exfat: add Samsung's open source exFat module version 1.2.4

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: AIO Optimization compatibility fixup

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

Conflicts:
	fs/Kconfig

Conflicts:
	Makefile
	arch/arm/configs/cm_fusion3_dogo_defconfig
	arch/arm/configs/cm_fusion3_odin_defconfig
	boot.img
	zImage
drivers/Makefile: add exFat support

Signed-off-by: Paul Reioux <reioux@gmail.com>
fs kconfig
exfat and some fixes

Conflicts:
	Makefile
	arch/arm/configs/cm_fusion3_yuga_defconfig
	boot.img
	zImage