mm: add new syscall set_mempolicy_home_node

Changes from v4:
* Add flags == 0 check
* Make sure the home node is online before updating memory policy.

Changes from v3:
* Fix build warning reported by kernel test robot

Changes from RFC v2:
* Rebase to latest kernel
* Update numa_memory_policy.rst



Aneesh Kumar K.V (3):
  mm/mempolicy: use policy_node helper with MPOL_PREFERRED_MANY
  mm/mempolicy: add set_mempolicy_home_node syscall
  mm/mempolicy: wire up syscall set_mempolicy_home_node

 .../admin-guide/mm/numa_memory_policy.rst     | 14 +++-
 arch/alpha/kernel/syscalls/syscall.tbl        |  2 +
 arch/arm/tools/syscall.tbl                    |  1 +
 arch/arm64/include/asm/unistd.h               |  2 +-
 arch/arm64/include/asm/unistd32.h             |  2 +
 arch/ia64/kernel/syscalls/syscall.tbl         |  2 +
 arch/m68k/kernel/syscalls/syscall.tbl         |  2 +
 arch/microblaze/kernel/syscalls/syscall.tbl   |  2 +
 arch/mips/kernel/syscalls/syscall_n32.tbl     |  2 +
 arch/mips/kernel/syscalls/syscall_n64.tbl     |  2 +
 arch/mips/kernel/syscalls/syscall_o32.tbl     |  2 +
 arch/parisc/kernel/syscalls/syscall.tbl       |  2 +
 arch/powerpc/kernel/syscalls/syscall.tbl      |  2 +
 arch/s390/kernel/syscalls/syscall.tbl         |  2 +
 arch/sh/kernel/syscalls/syscall.tbl           |  2 +
 arch/sparc/kernel/syscalls/syscall.tbl        |  2 +
 arch/x86/entry/syscalls/syscall_32.tbl        |  1 +
 arch/x86/entry/syscalls/syscall_64.tbl        |  1 +
 arch/xtensa/kernel/syscalls/syscall.tbl       |  2 +
 include/linux/mempolicy.h                     |  1 +
 include/linux/syscalls.h                      |  3 +
 include/uapi/asm-generic/unistd.h             |  5 +-
 kernel/sys_ni.c                               |  1 +
 mm/mempolicy.c                                | 67 ++++++++++++++++++-
 24 files changed, 119 insertions(+), 5 deletions(-)

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2.31.1