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[Christian Reis <kiko@xxxxxxxxxxxx>]

Adding Richard to see if he has any insight.

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https://bugs.launchpad.net/bugs/1519814

Title:
  spl/zfs fails to build on s390x

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged

Bug description:
  make -C /home/xnox/xenial/linux-4.3.0/debian/build/build-generic SUBDIRS=`pwd`  O=/home/xnox/xenial/linux-4.3.0/debian/build/build-generic CONFIG_SPL=m modules
  make[2]: Entering directory '/home/xnox/xenial/linux-4.3.0/debian/build/build-generic'
    CC [M]  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/splat/splat-ctl.o
    CC [M]  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-proc.o
    CC [M]  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-kmem.o
    CC [M]  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/splat/splat-kmem.o
    CC [M]  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-kmem-cache.o
  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-kmem-cache.c: In function 'spl_kmem_cache_alloc':
  /home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-kmem-cache.c:1464:4: error: implicit declaration of function 'prefetchw' [-Werror=implicit-function-declaration]
      prefetchw(obj);
      ^
  cc1: some warnings being treated as errors
  /home/xnox/xenial/linux-4.3.0/scripts/Makefile.build:258: recipe for target '/home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-kmem-cache.o' failed
  make[6]: *** [/home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl/spl-kmem-cache.o] Error 1
  /home/xnox/xenial/linux-4.3.0/scripts/Makefile.build:403: recipe for target '/home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl' failed
  make[5]: *** [/home/xnox/xenial/linux-4.3.0/debian/build/build-generic/spl/module/spl] Error 2
  make[5]: *** Waiting for unfinished jobs....

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