[Bug 1711478] Re: [FTBFS] arm does not define __NR_migrate_pages

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~paelzer/ubuntu/+source/numactl/+git/numactl/+merge/363777

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Title:
  [FTBFS] arm does not define __NR_migrate_pages

Status in numactl package in Ubuntu:
  Fix Released
Status in numactl source package in Bionic:
  Triaged
Status in numactl package in Debian:
  Fix Released

Bug description:
  [Impact]

   * Due to arm not defining __NR_migrate_pages
     Backport upstream changes to fix this as part of an ongoing SRU.
     - https://github.com/numactl/numactl/commit/e13c9a841

  [Test Case]

   * Does it build in -proposed (and PPAs to prove it)

  [Regression Potential]

   * The change is minimal, therefore I hope that the regression risk
     is rather low.
     If anything then different libc/kernel behavior could make it regress,
     but then IMHO that would apply to the current build in the archive as
     well and not be part of this SRU.

  [Other Info]

   * Found to affect Bionic when working on SRU for bug 1817258
   * Sorry for the short SRU template, but for FTBFS bugs I'm not sure if we need more

  ----

  numactl currently FTBFS since arm does not define __NR_migrate_pages.

  As described in the Debian bug comments [1] the function should just
  return -1 and set errno when __NR_migrate_pages is undefined. This
  prevents it from failing the build.

  Failure from the buildlog [2]:

  libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wall -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -c syscall.c  -fPIC -DPIC -o .libs/syscall.o
  syscall.c:113:2: error: #error "Add syscalls for your architecture or update kernel headers"
   #error "Add syscalls for your architecture or update kernel headers"
    ^~~~~
  syscall.c: In function ‘migrate_pages’:
  syscall.c:209:17: error: ‘__NR_migrate_pages’ undeclared (first use in this function); did you mean ‘numa_migrate_pages’?
    return syscall(__NR_migrate_pages, pid, maxnode, frommask, tomask);
                   ^~~~~~~~~~~~~~~~~~
                   numa_migrate_pages
  syscall.c:209:17: note: each undeclared identifier is reported only once for each function it appears in

  [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=796802#15
  [2] https://launchpadlibrarian.net/332625047/buildlog_ubuntu-artful-armhf.numactl_2.0.11-2.1_BUILDING.txt.gz

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