oprofile-reduce-mmap_sem-hold-for-mm-exe_file-fix

export get_mm_exe_file for arch/x86/oprofile/oprofile.ko

Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Robert Richter <rric@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

powerpc/oprofile: reduce mmap_sem hold for exe_file

In the future mm->exe_file will be done without mmap_sem serialization,
thus isolate and reorganize the related code to make the transition
easier.  Good users will, make use of the more standard get_mm_exe_file(),
requiring only holding the mmap_sem to read the value, and relying on
reference counting to make sure that the exe file won't dissappear
underneath us while getting the dcookie.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Robert Richter <rric@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

oprofile: reduce mmap_sem hold for mm->exe_file

sync_buffer() needs the mmap_sem for two distinct operations, both only
occurring upon user context switch handling:

 1) Dealing with the exe_file.

 2) Adding the dcookie data as we need to lookup the vma that
   backs it. This is done via add_sample() and add_data().

This patch isolates 1), for it will no longer need the mmap_sem for
serialization.  However, for now, make of the more standard
get_mm_exe_file(), requiring only holding the mmap_sem to read the value,
and relying on reference counting to make sure that the exe file won't
dissappear underneath us while doing the get dcookie.

As a consequence, for 2) we move the mmap_sem locking into where we really
need it, in lookup_dcookie().  The benefits are twofold: reduce mmap_sem
hold times, and cleaner code.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Robert Richter <rric@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mips: ip32: add platform data hooks to use DS1685 driver

This modifies the IP32 (SGI O2) platform and reset code to utilize the new
rtc-ds1685 driver.  The old mc146818rtc.h header is removed and ip32_defconfig
is updated as well.

Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

lib/Kconfig: fix up HAVE_ARCH_BITREVERSE help text

Cc: Yalin Wang <yalin.wang@sonymobile.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/unicore32/kernel/fpu-ucf64.c: remove unnecessary KERN_ERR

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Merge branch 'akpm-current/current'

Conflicts:
Documentation/printk-formats.txt
arch/arm64/Kconfig
arch/parisc/include/asm/Kbuild
arch/s390/mm/mmap.c
drivers/rtc/class.c
drivers/rtc/rtc-mc13xxx.c
fs/ext2/file.c
fs/ext4/file.c
fs/fat/inode.c

Merge remote-tracking branch 'livepatching/for-next'

Conflicts:
arch/s390/Kconfig

Merge remote-tracking branch 'y2038/y2038'

Conflicts:
drivers/staging/media/lirc/lirc_parallel.c

Merge remote-tracking branch 'kselftest/next'

Conflicts:
tools/testing/selftests/powerpc/Makefile

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Merge remote-tracking branch 'clk/clk-next'

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Merge remote-tracking branch 'dma-mapping/dma-mapping-next'

Merge remote-tracking branch 'gpio/for-next'

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Conflicts:
drivers/usb/dwc3/dwc3-pci.c

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Conflicts:
Documentation/Makefile

Merge remote-tracking branch 'extcon/extcon-next'

Merge remote-tracking branch 'char-misc/char-misc-next'

Merge remote-tracking branch 'staging/staging-next'

Conflicts:
drivers/staging/media/mn88473/mn88473.c

Merge remote-tracking branch 'usb-gadget/next'

Merge remote-tracking branch 'usb/usb-next'

Merge remote-tracking branch 'tty/tty-next'

Conflicts:
drivers/dma/Kconfig

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Merge remote-tracking branch 'ipmi/for-next'

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Conflicts:
drivers/xen/Kconfig

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Conflicts:
arch/mips/kernel/genex.S

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Conflicts:
arch/arm/mach-exynos/suspend.c

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Merge remote-tracking branch 'clockevents/clockevents/next'

Conflicts:
arch/arm/mach-rockchip/Kconfig
drivers/clocksource/Kconfig
drivers/clocksource/rockchip_timer.c

Merge remote-tracking branch 'tip/auto-latest'

Conflicts:
include/linux/bpf.h
include/uapi/linux/bpf.h
samples/bpf/Makefile

Merge remote-tracking branch 'spi/for-next'

Conflicts:
drivers/dma/intel_mid_dma.c
drivers/dma/intel_mid_dma_regs.h

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Merge remote-tracking branch 'devicetree/devicetree/next'

Conflicts:
Documentation/devicetree/bindings/mips/brcm/brcm,bcm3384-intc.txt
Documentation/devicetree/bindings/mips/brcm/brcm,cm-dsl.txt

Merge remote-tracking branch 'audit/next'

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Conflicts:
drivers/char/tpm/tpm-chip.c

Merge remote-tracking branch 'regulator/for-next'

Merge remote-tracking branch 'omap_dss2/for-next'

Merge remote-tracking branch 'battery/master'

Conflicts:
drivers/hid/wacom.h
drivers/hid/wacom_sys.c

Merge remote-tracking branch 'backlight/for-backlight-next'

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Merge remote-tracking branch 'sound/for-next'

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Merge remote-tracking branch 'drm-misc/topic/drm-misc'

Merge remote-tracking branch 'drm/drm-next'

Merge remote-tracking branch 'crypto/master'

Conflicts:
crypto/Kconfig

Merge remote-tracking branch 'l2-mtd/master'

Merge remote-tracking branch 'bluetooth/master'

Merge remote-tracking branch 'wireless-drivers-next/master'

Merge remote-tracking branch 'ipsec-next/master'

Merge remote-tracking branch 'slave-dma/next'

Conflicts:
arch/arm/mach-shmobile/board-ape6evm.c
arch/arm/mach-shmobile/board-mackerel.c

Merge remote-tracking branch 'thermal-soc/next'

Merge remote-tracking branch 'thermal/next'

Merge remote-tracking branch 'idle/next'

Merge remote-tracking branch 'pm/linux-next'

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Merge remote-tracking branch 'hwmon-staging/hwmon-next'

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Merge remote-tracking branch 'hid/for-next'

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Conflicts:
fs/ext4/inode.c
fs/udf/file.c
net/9p/protocol.c

Merge remote-tracking branch 'net-next/master'

Merge remote-tracking branch 'file-locks/linux-next'

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