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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

For clarity it did also enable NUMA, though there are further
corrections to be made there.  It also disabled a number of redundant
hardware options as requested.  It did not change the ASYNC option which
I will discuss in the newly opened bug.

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https://bugs.launchpad.net/bugs/1543165

Title:
  kernel: update kernel configuration

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  == Comment: #0 - Hendrik Brueckner <brueckner@xxxxxxxxxx> - 2016-02-08 09:41:49 ==
  The below mentioned kernel configuration options are still not yet integrated into the Ubuntu kernel. In addition to the discussions on the skipper mailing list, hereby the bugzilla / launchpad to integrate and update the kernel configuration.

  > Short explaination for all requested changes:
  >
  > CONFIG_NUMA (and all related config options):
  > s390 gained fake NUMA support with kernel version 4.3. Performance
  > measurements did show that this helps for very large machines (lot's of
  > memory), and also doesn't hurt for small machines.  Therfore the config
  > option should be enabled.
  >
  > CONFIG_PREEMPT_NONE:
  > We only have performance numbers for non-preemptible kernels. While kernel
  > preemption generally should work from a functional point of view on s390,
  > we do not have numbers about the performance costs. Nor do we have any
  > production systems running with kernel preemption enabled currently.
  > Therefore let's please switch to PREEMPT_NONE which has proven to work.
  >
  > CONFIG_SCSI_SCAN_ASYNC:
  > Hendrik already requested to disable this config option.
  >
  > CONFIG_REGMAP,
  > CONFIG_NET_VENDOR_EMULEX,
  > CONFIG_BE2NET,
  > CONFIG_BE2NET_VXLAN,
  > CONFIG_NET_VENDOR_SYNOPSYS,
  > CONFIG_NVMEM:
  > Looks like all of these crept in with the kernel update to 4.3. None of
  > these are relevant to s390 and can be disabled.

  An updated config patch to the kernel version above will be added

  ====
  Kernel-Description: s390x -- various configuration changes

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