Merge branch 'x86/entry' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into tif-task_work.arch

* 'x86/entry' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Wire up TIF_NOTIFY_SIGNAL
  x86: Reclaim TIF_IA32 and TIF_X32
  x86/mm: Convert mmu context ia32_compat into a proper flags field
  x86/elf: Use e_machine to check for x32/ia32 in setup_additional_pages()
  elf: Expose ELF header on arch_setup_additional_pages()
  x86/elf: Use e_machine to select start_thread for x32
  elf: Expose ELF header in compat_start_thread()
  x86/elf: Use e_machine to choose DLINFO in compat
  x86/oprofile: Avoid TIF_IA32 when checking 64bit mode
  x86/compat: Simplify compat syscall userspace allocation
  perf/x86: Avoid TIF_IA32 when checking 64bit mode