ARM: introduce Kernel Mode NEON

ARM: move VFP init to an earlier boot stage

In order to use the NEON unit in the kernel, we should
initialize it a bit earlier in the boot process so NEON users
that like to do a quick benchmark at load time (like the
xor_blocks or RAID-6 code) find the NEON/VFP unit already
enabled.

Replaced late_initcall() with core_initcall().

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

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

Conflicts:
	arch/arm/vfp/vfpmodule.c

ARM: be strict about FP exceptions in kernel mode

The support code in vfp_support_entry does not care whether the
exception that caused it to be invoked occurred in kernel mode or
in user mode. However, neither condition that could trigger this
exception (lazy restore and VFP bounce to support code) is
currently allowable in kernel mode.

In either case, print a message describing the condition before
letting the undefined instruction handler run its course and trigger
an oops.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Acked-by: Nicolas Pitre <nico at linaro.org>
Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/vfp/vfpmodule.c

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

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: 7835/2: fix modular build of xor_blocks() with NEON enabled

Commit 0195659 introduced a NEON accelerated version of the xor_blocks()
function, but it needs the changes in this patch to allow it to be built
as a module rather than statically into the kernel.

This patch creates a separate module xor-neon.ko which exports the NEON
inner xor_blocks() functions depended upon by the regular xor.ko if it
is built with CONFIG_KERNEL_MODE_NEON=y

Reported-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: only allow kernel mode neon with AEABI

This prevents the linker erroring with:

arm-linux-ld: error: arch/arm/lib/xor-neon.o uses VFP instructions, whereas arch/arm/lib/built-in.o does not
arm-linux-ld: failed to merge target specific data of file arch/arm/lib/xor-neon.o

This is due to the non-neon files being marked as containing FPA data/
instructions (even though they do not) being mixed with files which
contain VFP, which is an incompatible floating point format.

Change-Id: Ib86af25a348a07fac3ca3b688e02e885d4ce7ea0
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
bitmap: compile with -Os

Change-Id: I335a1eb92cfc0b17f85b3a53f120cc407a0f293a
drivers/exfat: add Samsung's open source exFat module version 1.2.4

Signed-off-by: Paul Reioux <reioux@gmail.com>
drivers/Makefile: add exFat support

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

Conflicts:
	drivers/Makefile

Conflicts:
	drivers/Makefile

Conflicts:
	drivers/Makefile
exfat: AIO Optimization compatibility fixup

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

Conflicts:
	fs/Kconfig
exfat: sync'ed to latest driver from https://github.com/dorimanx/exfat-nofuse

thanks to @dorimanx and others who have contributed to exfat development

moved under fs/ to be the same as other fs drivers

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

Conflicts:
	fs/Kconfig

Conflicts:
	fs/Kconfig
exfat: hacked name for HTC's hardcoded vold

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: more HTC vold mount option hacks!

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: change printk to debug printk to reduce dmesg spam/flood

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: fix derpy #defines

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: more #define fix ups.

remove "feature flags" because they have already been moved to Kconfig.
this will eliminate flag clashing

Signed-off-by: Paul Reioux <reioux@gmail.com>
exfat: clean up old remanent

Signed-off-by: Paul Reioux <reioux@gmail.com>
Merge in dorimanx/exfat-nofuse

Conflicts:
	fs/Kconfig
msm: kgsl: Export device state to devfreq

Conflicts:
	drivers/gpu/msm/kgsl_pwrctrl.c