The mmap semaphore should not be taken when page faults are disabled.
Since pagefault_disable() no longer disables preemption, we now need
to use faulthandler_disabled() in place of in_atomic().

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

We don't want GCC optimising our memset_io(), memcpy_fromio() or
memcpy_toio() variants, so we must not call one of the standard
functions.  Provide a separate name for our assembly memcpy() and
memset() functions, and use that instead, thereby bypassing GCC's
ability to optimise these operations.

GCCs optimisation may introduce unaligned accesses which are invalid
for device mappings.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Pull ARM updates from Russell King:
 "Bigger items included in this update are:

   - A series of updates from Arnd for ARM randconfig build failures
   - Updates from Dmitry for StrongARM SA-1100 to move IRQ handling to
     drivers/irqchip/
   - Move ARMs SP804 timer to drivers/clocksource/
   - Perf updates from Mark Rutland in preparation to move the ARM perf
     code into drivers/ so it can be shared with ARM64.
   - MCPM updates from Nicolas
   - Add support for taking platform serial number from DT
   - Re-implement Keystone2 physical address space switch to conform to
     architecture requirements
   - Clean up ARMv7 LPAE code, which goes in hand with the Keystone2
     changes.
   - L2C cleanups to avoid unlocking caches if we're prevented by the
     secure support to unlock.
   - Avoid cleaning a potentially dirty cache containing stale data on
     CPU initialisation
   - Add ARM-only entry point for secondary startup (for machines that
     can only call into a Thumb kernel in ARM mode).  Same thing is also
     done for the resume entry point.
   - Provide arch_irqs_disabled via asm-generic
   - Enlarge ARMv7M vector table
   - Always use BFD linker for VDSO, as gold doesn't accept some of the
     options we need.
   - Fix an incorrect BSYM (for Thumb symbols) usage, and convert all
     BSYM compiler macros to a "badr" (for branch address).
   - Shut up compiler warnings provoked by our cmpxchg() implementation.
   - Ensure bad xchg sizes fail to link"

* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (75 commits)
  ARM: Fix build if CLKDEV_LOOKUP is not configured
  ARM: fix new BSYM() usage introduced via for-arm-soc branch
  ARM: 8383/1: nommu: avoid deprecated source register on mov
  ARM: 8391/1: l2c: add options to overwrite prefetching behavior
  ARM: 8390/1: irqflags: Get arch_irqs_disabled from asm-generic
  ARM: 8387/1: arm/mm/dma-mapping.c: Add arm_coherent_dma_mmap
  ARM: 8388/1: tcm: Don't crash when TCM banks are protected by TrustZone
  ARM: 8384/1: VDSO: force use of BFD linker
  ARM: 8385/1: VDSO: group link options
  ARM: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations
  ARM: remove __bad_xchg definition
  ARM: 8369/1: ARMv7M: define size of vector table for Vybrid
  ARM: 8382/1: clocksource: make ARM_TIMER_SP804 depend on GENERIC_SCHED_CLOCK
  ARM: 8366/1: move Dual-Timer SP804 driver to drivers/clocksource
  ARM: 8365/1: introduce sp804_timer_disable and remove arm_timer.h inclusion
  ARM: 8364/1: fix BE32 module loading
  ARM: 8360/1: add secondary_startup_arm prototype in header file
  ARM: 8359/1: correct secondary_startup_arm mode
  ARM: proc-v7: sanitise and document registers around errata
  ARM: proc-v7: clean up MIDR access
  ...

Pull trivial tree updates from Jiri Kosina:
 "As usual, mostly comment, kerneldoc and printk() fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial:
  lpfc: Grammar s/an negative/a negative/
  ARM: lib/lib1funcs.S: fix typo s/substractions/subtractions/
  cx25821: cx25821-medusa-reg.h: fix 0x0x prefix
  lib: crc-itu-t.[ch] fix 0x0x prefix in integer constants
  rapidio: Fix kerneldoc and comment
  qla4xxx: Fix printk() in qla4_83xx_read_reset_template() and qla4_83xx_pre_loopback_config()
  treewide: Kconfig: fix wording / spelling
  usb/serial: fix grammar in Kconfig help text for FTDI_SIO
  megaraid_sas: fix kerneldoc
  netfilter: ebtables: fix comment grammar
  drm/radeon: fix comment
  isdn: fix grammar in comment
  ARM: KVM: fix comment

Signed-off-by: Antonio Ospite <ao2@ao2.it>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

BSYM() was invented to allow us to work around a problem with the
assembler, where local symbols resolved by the assembler for the 'adr'
instruction did not take account of their ISA.

Since we don't want BSYM() used elsewhere, replace BSYM() with a new
macro 'badr', which is like the 'adr' pseudo-op, but with the BSYM()
mechanics integrated into it.  This ensures that the BSYM()-ification
is only used in conjunction with 'adr'.

Acked-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

We have recently had an example of someone wanting to use a 90kHz timer
for the software delay loop.

udelay() needs to have at least microsecond resolution to allow drivers
access to a delay mechanism with a reasonable chance of delaying the
period they requested within at least a 50% marging of error, especially
for small delays.

Discussion about the udelay() accuracy can be found at:
	https://lkml.org/lkml/2011/1/9/37

Reject timers which are unable to supply this level of resolution.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

This moves all fixup snippets to the .text.fixup section, which is
a special section that gets emitted along with the .text section
for each input object file, i.e., the snippets are kept much closer
to the code they refer to, which helps prevent linker failure on
large kernels.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

This code was restored with commit 080fc66fb5 ("ARM: Bring back ARMv3 IO
and user access code") because the RiscPC memory bus does not understand
half-word load/stores.  However only the IO code needed restoring since
the alternative user access code contains no half-word accesses, is
already used when CONFIG_PREEMPT is set and runs faster on a StrongARM.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

The memory copy functions(memcpy, __copy_from_user, __copy_to_user)
never had unwinding annotations added. Currently, when accessing
invalid pointer by these functions occurs the backtrace shown will
stop at these functions or some completely unrelated function.
Add unwinding annotations in hopes of getting a more useful backtrace
in following cases:
1. die on accessing invalid pointer by these functions
2. kprobe trapped at any instruction within these functions
3. interrupted at any instruction within these functions

Signed-off-by: Lin Yongting <linyongting@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>