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[Bug 1520627] Re: New personality for more accurate armv7l emulation on arm64


This bug was fixed in the package linux - 4.2.0-27.32

linux (4.2.0-27.32) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1536867

  [ Andy Whitcroft ]

  * SAUCE: (no-up) add compat_uts_machine= kernel command line override
    - LP: #1520627

  [ Colin Ian King ]

  * SAUCE: (no-up) ACPI / tables: Add acpi_force_32bit_fadt_addr option to
    force 32 bit FADT addresses
    - LP: #1529381

  [ Eric Dumazet ]

  * SAUCE: (no-up) udp: properly support MSG_PEEK with truncated buffers
    - LP: #1527902

  [ Guilherme G. Piccoli ]

  * SAUCE: powerpc/eeh: Validate arch in eeh_add_device_early()
    - LP: #1486180

  [ Tim Gardner ]

  * SAUCE: (no-up) Revert "[SCSI] libiscsi: Reduce locking contention in
    fast path"
    - LP: #1517142
  * [Config] Add DRM ast driver to udeb installer image
    - LP: #1514711

  [ Upstream Kernel Changes ]

  * net/mlx5e: Re-eanble client vlan TX acceleration
    - LP: #1533249
  * net/mlx5e: Fix LSO vlan insertion
    - LP: #1533249
  * net/mlx5e: Fix inline header size calculation
    - LP: #1533249
  * net: usb: cdc_ncm: Adding Dell DW5812 LTE Verizon Mobile Broadband Card
    - LP: #1533118
  * net: usb: cdc_ncm: Adding Dell DW5813 LTE AT&T Mobile Broadband Card
    - LP: #1533118
  * powerpc/eeh: Fix recursive fenced PHB on Broadcom shiner adapter
    - LP: #1532942

linux (4.2.0-26.31) wily; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1535795
  * Merged back Ubuntu-4.2.0-25.30

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Thu, 21 Jan 2016 18:44:37 -0800

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

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  New personality for more accurate armv7l emulation on arm64

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  In Progress

Bug description:
  We're working on bringing up new arm64 builder infrastructure in
  Launchpad scalingstack to replace the current bare-metal builders, and
  the current plan is that they should be able to cover armhf as well.
  Ideally, we would be able to do this using the same guest images:
  scalingstack builders are reset at the end of the previous build so
  that latency for new builds is lower when the build farm isn't at 100%
  use, which means that we don't in general know which architecture a
  given builder is going to need to build next, so we can get better
  density out of our hardware by having the same guest images be able to
  handle more than one architecture.

  Things mostly work just by chrooting into an armhf chroot under
  linux32.  However, this causes "uname -m" to print "armv8l", while our
  current value on our armhf builders is "armv7l".  I'd initially
  thought that this would be tolerable, but my understanding from Adam
  Conrad is that the breakage from poorly-written build scripts that
  misdetect the architecture as a result is quite widespread.  So, we
  would like to have a personality value available that would cause
  "uname -m" to print "armv7l".

  This doesn't look completely trivial, because newuname() basically
  just has compat and non-compat mode for architectures based on whether
  the personality is PER_LINUX32 or not, and doesn't currently seem to
  have extension points beyond that.  I'm hoping this is fixable.  If
  not, we need to know with as much lead time as possible so that we can
  bring up separate armhf guests, since that's going to be a fair amount
  of work for us to arrange.

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