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[Launchpad Bug Tracker <1691614@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.11.0-10.15

---------------
linux (4.11.0-10.15) artful; urgency=low

  * linux: 4.11.0-10.15 -proposed tracker (LP: #1701271)

  * Artful update to v4.11.8 stable release (LP: #1701269)
    - clk: sunxi-ng: a31: Correct lcd1-ch1 clock register offset
    - clk: sunxi-ng: v3s: Fix usb otg device reset bit
    - clk: sunxi-ng: sun5i: Fix ahb_bist_clk definition
    - xen/blkback: fix disconnect while I/Os in flight
    - xen-blkback: don't leak stack data via response ring
    - ALSA: firewire-lib: Fix stall of process context at packet error
    - ALSA: pcm: Don't treat NULL chmap as a fatal error
    - ALSA: hda - Add Coffelake PCI ID
    - ALSA: hda - Apply quirks to Broxton-T, too
    - fs/exec.c: account for argv/envp pointers
    - powerpc/perf: Fix oops when kthread execs user process
    - autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL
    - fs/dax.c: fix inefficiency in dax_writeback_mapping_range()
    - lib/cmdline.c: fix get_options() overflow while parsing ranges
    - perf/x86/intel: Add 1G DTLB load/store miss support for SKL
    - perf probe: Fix probe definition for inlined functions
    - KVM: x86: fix singlestepping over syscall
    - KVM: MIPS: Fix maybe-uninitialized build failure
    - KVM: s390: gaccess: fix real-space designation asce handling for gmap
      shadows
    - KVM: PPC: Book3S HV: Cope with host using large decrementer mode
    - KVM: PPC: Book3S HV: Preserve userspace HTM state properly
    - KVM: PPC: Book3S HV: Ignore timebase offset on POWER9 DD1
    - KVM: PPC: Book3S HV: Context-switch EBB registers properly
    - KVM: PPC: Book3S HV: Restore critical SPRs to host values on guest exit
    - KVM: PPC: Book3S HV: Save/restore host values of debug registers
    - CIFS: Improve readdir verbosity
    - CIFS: Fix some return values in case of error in 'crypt_message'
    - cxgb4: notify uP to route ctrlq compl to rdma rspq
    - HID: Add quirk for Dell PIXART OEM mouse
    - random: silence compiler warnings and fix race
    - signal: Only reschedule timers on signals timers have sent
    - powerpc/kprobes: Pause function_graph tracing during jprobes handling
    - powerpc/64s: Handle data breakpoints in Radix mode
    - Input: i8042 - add Fujitsu Lifebook AH544 to notimeout list
    - brcmfmac: add parameter to pass error code in firmware callback
    - brcmfmac: use firmware callback upon failure to load
    - brcmfmac: unbind all devices upon failure in firmware callback
    - time: Fix clock->read(clock) race around clocksource changes
    - time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting
    - arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW
    - target: Fix kref->refcount underflow in transport_cmd_finish_abort
    - iscsi-target: Fix delayed logout processing greater than
      SECONDS_FOR_LOGOUT_COMP
    - iscsi-target: Reject immediate data underflow larger than SCSI transfer
      length
    - drm/radeon: add a PX quirk for another K53TK variant
    - drm/radeon: add a quirk for Toshiba Satellite L20-183
    - drm/amdgpu/atom: fix ps allocation size for EnableDispPowerGating
    - drm/amdgpu: adjust default display clock
    - drm/amdgpu: add Polaris12 DID
    - ACPI / scan: Apply default enumeration to devices with ACPI drivers
    - ACPI / scan: Fix enumeration for special SPI and I2C devices
    - rxrpc: Fix several cases where a padded len isn't checked in ticket decode
    - drm: Fix GETCONNECTOR regression
    - usb: gadget: f_fs: avoid out of bounds access on comp_desc
    - spi: double time out tolerance
    - net: phy: fix marvell phy status reading
    - brcmfmac: fix uninitialized warning in brcmf_usb_probe_phase2()
    - Linux 4.11.8

  * powerpc: Invalidate ERAT on powersave wakeup for POWER9 (LP: #1700521)
    - SAUCE: powerpc: Invalidate ERAT on powersave wakeup for POWER9

  * Miscellaneous Ubuntu changes
    - d-i: Move qcom-emac from arm64 to shared nic-modules

 -- Seth Forshee <seth.forshee@xxxxxxxxxxxxx>  Thu, 29 Jun 2017 08:46:53
-0500

** Changed in: linux (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1691614

Title:
  please enable CONFIG_ARM64_LSE_ATOMICS

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Won't Fix
Status in linux source package in Yakkety:
  Won't Fix
Status in linux source package in Zesty:
  Won't Fix

Bug description:
  [Impact]
  Performance is lowered for ARM >= v8.1 cpus by not taking advantage of the "Large System Extenstion" atomic instructions they provide.

  Note: This config was enabled during xenial development, but was
  disabled to workaround a FTBFS[*] due to us not having a new enough
  binutils to support it. binutils was later updated in xenial, and
  supports these instructions.

  [Test Case]
  grep CONFIG_ARM64_LSE_ATOMICS=y /boot/config-$(uname -r)

  [Regression Risk]
  There is a known small performance overhead for < ARMv8.1 arm64 systems (noted in the Kconfig). To mitigate the risk of runtime or build failures, this should be tested on both ARMv8 and >= ARMv8.1 systems, to exercise both code paths.

  [*] https://answers.launchpad.net/~canonical-kernel-
  team/+archive/ubuntu/unstable/+build/8438034

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