[git pull] misc followups to regset work

[Al Viro]

	Dead code removal, mostly; the only exception is a bit of cleanups
on itanic (getting rid of redundant stack unwinds - each access_uarea()
call does it and we call that 7 times in a row in ptrace_[sg]etregs(), *after*
having done it ourselves in the caller; location where the user registers
have been spilled won't change under us, and we can bloody well just call
access_elf_reg() directly, giving it the unw_frame_info we'd calculated for
our own purposes).

The following changes since commit 3650b228f83adda7e5ee532e2b90429c03f7b9ec:

  Linux 5.10-rc1 (2020-10-25 15:14:11 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git regset.followup

for you to fetch changes up to d4948d19d47f08f926db55f0fb8cb324e43f1c19:

  c6x: kill ELF_CORE_COPY_FPREGS (2020-10-25 20:03:06 -0400)

----------------------------------------------------------------
Al Viro (5):
      arm: kill dump_task_regs()
      [ia64] missed cleanups from switch to regset coredumps
      [ia64] ptrace_[sg]etregs(): use access_elf_reg() instead of access_uarea()
      whack-a-mole: USE_ELF_CORE_DUMP
      c6x: kill ELF_CORE_COPY_FPREGS

 arch/arm/include/asm/elf.h     |  4 ----
 arch/arm/kernel/process.c      |  9 --------
 arch/c6x/include/asm/elf.h     |  3 ---
 arch/csky/include/asm/elf.h    |  1 -
 arch/hexagon/include/asm/elf.h |  1 -
 arch/ia64/kernel/process.c     |  2 +-
 arch/ia64/kernel/ptrace.c      | 51 ++++++++++++++++++++++--------------------
 arch/nds32/include/asm/elf.h   |  1 -
 8 files changed, 28 insertions(+), 44 deletions(-)