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Brian Bloniarz 71378785b6 Fix OpenSSH pty regression on close 
commit 0f40fbbcc3 upstream.

OpenSSH expects the (non-blocking) read() of pty master to return
EAGAIN only if it has received all of the slave-side output after
it has received SIGCHLD. This used to work on pre-3.12 kernels.

This fix effectively forces non-blocking read() and poll() to
block for parallel i/o to complete for all ttys. It also unwinds
these changes:

1) f8747d4a46
   tty: Fix pty master read() after slave closes

2) 52bce7f8d4
   pty, n_tty: Simplify input processing on final close

3) 1a48632ffe
   pty: Fix input race when closing

Inspired by analysis and patch from Marc Aurele La France <tsi@tuyoix.net>

Reported-by: Volth <openssh@volth.com>
Reported-by: Marc Aurele La France <tsi@tuyoix.net>
BugLink: https://bugzilla.mindrot.org/show_bug.cgi?id=52
BugLink: https://bugzilla.mindrot.org/show_bug.cgi?id=2492
Signed-off-by: Brian Bloniarz <brian.bloniarz@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-06-01 12:15:52 -07:00
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ABI
usb: core: lpm: fix usb3_hardware_lpm sysfs node
2016-01-31 11:28:58 -08:00
accounting
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acpi
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aoe
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arm
ARM: dts: keystone: k2l: fix kernel crash when clk_ignore_unused is not in bootargs
2015-11-23 10:36:27 -08:00
arm64
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
2015-11-04 14:47:13 -08:00
auxdisplay
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backlight
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blackfin
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block
null_blk: register as a LightNVM device
2015-11-16 15:22:28 -07:00
blockdev
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bus-devices
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cdrom
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cgroups
Merge tag 'docs-for-linus' of git://git.lwn.net/linux
2015-11-05 15:59:24 -08:00
cma
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connector
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console
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cpu-freq
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cpuidle
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cris
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crypto
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development-process
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device-mapper
Merge tag 'dm-4.4-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
2015-11-04 21:19:53 -08:00
devicetree
ata: ahci-platform: Add ports-implemented DT bindings.
2016-05-11 11:21:21 +02:00
dmaengine
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DocBook
Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
2015-11-10 09:33:06 -08:00
driver-model
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dvb
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early-userspace
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EDID
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extcon
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fault-injection
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fb
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features
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
2015-11-04 14:47:13 -08:00
filesystems
efi: Make efivarfs entries immutable by default
2016-03-03 15:07:09 -08:00
firmware_class
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fmc
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fpga
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frv
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gpio
Merge tag 'docs-for-linus' of git://git.lwn.net/linux
2015-11-05 15:59:24 -08:00
hid
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hwmon
Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
2015-11-10 15:00:03 -08:00
i2c
i2c: i801: add Intel Lewisburg device IDs
2015-11-20 16:22:21 +01:00
ia64
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ide
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infiniband
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input
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ioctl
Merge tag 'char-misc-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
2015-11-04 22:15:15 -08:00
isdn
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ja_JP
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kbuild
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kdump
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ko_KR
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laptops
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leds
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locking
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-11-03 16:10:43 -08:00
m68k
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memory-devices
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metag
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mic
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mips
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misc-devices
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mmc
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mn10300
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mtd
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namespaces
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netlabel
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networking
e100.txt: Cleanup license info in kernel doc
2015-12-03 12:58:10 -08:00
nfc
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nios2
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nvdimm
libnvdimm: documentation clarifications
2015-11-12 09:55:23 -08:00
nvmem
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parisc
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PCI
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pcmcia
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phy
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platform
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power
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powerpc
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pps
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prctl
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pti
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ptp
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rapidio
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RCU
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s390
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scheduler
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scsi
st: allow debug output to be enabled or disabled via sysfs
2015-11-09 17:17:27 -08:00
security
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serial
Fix OpenSSH pty regression on close
2016-06-01 12:15:52 -07:00
sh
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sound
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spi
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sysctl
Documentation/sysctl/vm.txt: fix misleading code reference of overcommit_memory
2015-11-09 15:11:24 -08:00
target
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thermal
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timers
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tpm
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trace
Merge tag 'trace-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2015-11-06 13:30:20 -08:00
usb
usb: core: lpm: fix usb3_hardware_lpm sysfs node
2016-01-31 11:28:58 -08:00
vDSO
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video4linux
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virtual
KVM: MMU: fix ept=0/pte.u=1/pte.w=0/CR0.WP=0/CR4.SMEP=1/EFER.NX=0 combo
2016-03-16 08:42:58 -07:00
vm
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
w1
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watchdog
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wimax
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x86
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xtensa
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zh_CN
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00-INDEX
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adding-syscalls.txt
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applying-patches.txt
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assoc_array.txt
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atomic_ops.txt
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bad_memory.txt
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basic_profiling.txt
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bcache.txt
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binfmt_misc.txt
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braille-console.txt
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bt8xxgpio.txt
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btmrvl.txt
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BUG-HUNTING
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bus-virt-phys-mapping.txt
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cachetlb.txt
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Changes
Merge tag 'docs-for-linus' of git://git.lwn.net/linux
2015-11-05 15:59:24 -08:00
circular-buffers.txt
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clk.txt
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coccinelle.txt
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CodeOfConflict
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CodingStyle
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cpu-hotplug.txt
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cpu-load.txt
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cputopology.txt
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crc32.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt
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devices.txt
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digsig.txt
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DMA-API-HOWTO.txt
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DMA-API.txt
dma: remove external references to dma_supported
2015-11-09 15:11:24 -08:00
DMA-attributes.txt
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dma-buf-sharing.txt
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DMA-ISA-LPC.txt
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dontdiff
Documentation: dontdiff: remove media from dontdiff
2015-11-11 10:08:07 -07:00
dynamic-debug-howto.txt
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edac.txt
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efi-stub.txt
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eisa.txt
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email-clients.txt
Merge tag '4.4-additional' of git://git.lwn.net/linux
2015-11-13 09:19:05 -08:00
flexible-arrays.txt
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futex-requeue-pi.txt
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gcov.txt
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gdb-kernel-debugging.txt
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highuid.txt
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HOWTO
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hsi.txt
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hw_random.txt
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hwspinlock.txt
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init.txt
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initrd.txt
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intel_txt.txt
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Intel-IOMMU.txt
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io_ordering.txt
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io-mapping.txt
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iostats.txt
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IPMI.txt
ipmi watchdog : add panic_wdt_timeout parameter
2015-11-16 06:28:43 -06:00
IRQ-affinity.txt
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IRQ-domain.txt
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IRQ.txt
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irqflags-tracing.txt
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isapnp.txt
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java.txt
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kasan.txt
mm, slub, kasan: enable user tracking by default with KASAN=y
2015-11-05 19:34:48 -08:00
kernel-doc-nano-HOWTO.txt
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kernel-docs.txt
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kernel-parameters.txt
USB: uas: Add a new NO_REPORT_LUNS quirk
2016-04-20 15:42:07 +09:00
kernel-per-CPU-kthreads.txt
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kmemcheck.txt
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kmemleak.txt
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kobject.txt
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kprobes.txt
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kref.txt
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kselftest.txt
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ldm.txt
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local_ops.txt
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lockup-watchdogs.txt
kernel/watchdog.c: add sysctl knob hardlockup_panic
2015-11-05 19:34:48 -08:00
logo.gif
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logo.txt
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lzo.txt
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magic-number.txt
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mailbox.txt
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Makefile
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ManagementStyle
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md-cluster.txt
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md.txt
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media-framework.txt
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memory-barriers.txt
atomic: remove all traces of READ_ONCE_CTRL() and atomic*_read_ctrl()
2015-11-03 17:22:17 -08:00
memory-hotplug.txt
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men-chameleon-bus.txt
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module-signing.txt
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mono.txt
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nommu-mmap.txt
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ntb.txt
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numastat.txt
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oops-tracing.txt
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padata.txt
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parport-lowlevel.txt
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parport.txt
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percpu-rw-semaphore.txt
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phy.txt
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pi-futex.txt
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pinctrl.txt
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pnp.txt
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preempt-locking.txt
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printk-formats.txt
lib/vsprintf.c: update documentation
2015-11-06 17:50:42 -08:00
pwm.txt
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ramoops.txt
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rbtree.txt
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remoteproc.txt
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rfkill.txt
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robust-futex-ABI.txt
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robust-futexes.txt
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rpmsg.txt
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rtc.txt
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SAK.txt
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SecurityBugs
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serial-console.txt
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sgi-ioc4.txt
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SM501.txt
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smsc_ece1099.txt
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sparse.txt
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stable_api_nonsense.txt
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stable_kernel_rules.txt
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static-keys.txt
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SubmitChecklist
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SubmittingDrivers
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SubmittingPatches
Merge tag '4.4-additional' of git://git.lwn.net/linux
2015-11-13 09:19:05 -08:00
svga.txt
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sysfs-rules.txt
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sysrq.txt
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this_cpu_ops.txt
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unaligned-memory-access.txt
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unicode.txt
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unshare.txt
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vfio.txt
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VGA-softcursor.txt
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vgaarbiter.txt
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video-output.txt
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vme_api.txt
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volatile-considered-harmful.txt
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workqueue.txt
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xillybus.txt
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xz.txt
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zorro.txt
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