[PATCH 00/12] x86: Rewrite 64-bit syscall code

[Andy Lutomirski <luto@kernel.org>]

This is kind of like the 32-bit and compat code, except that I
preserved the fast path this time.  I was unable to measure any
significant performance change on my laptop in the fast path.

What do you all think?

Andy Lutomirski (12):
  selftests/x86: Extend Makefile to allow 64-bit only tests
  selftests/x86: Add check_initial_reg_state
  x86/syscalls: Refactor syscalltbl.sh
  x86/syscalls: Remove __SYSCALL_COMMON and __SYSCALL_X32
  x86/syscalls: Move compat syscall entry handling into syscalltbl.sh
  x86/syscalls: Add syscall entry qualifiers
  x86/entry/64: Always run ptregs-using syscalls on the slow path
  x86/entry/64: Call all native slow-path syscalls with full pt-regs
  x86/entry/64: Stop using int_ret_from_sys_call in ret_from_fork
  x86/entry/64: Migrate the 64-bit syscall slow path to C
  x86/entry/32: Change INT80 to be an interrupt gate
  x86/entry: Do enter_from_user_mode with IRQs off

 arch/x86/entry/common.c                            |  80 +++----
 arch/x86/entry/entry_32.S                          |   8 +-
 arch/x86/entry/entry_64.S                          | 245 ++++++---------------
 arch/x86/entry/entry_64_compat.S                   |   2 +-
 arch/x86/entry/syscall_32.c                        |  10 +-
 arch/x86/entry/syscall_64.c                        |  30 ++-
 arch/x86/entry/syscalls/syscall_64.tbl             |  18 +-
 arch/x86/entry/syscalls/syscalltbl.sh              |  58 ++++-
 arch/x86/include/asm/thread_info.h                 |   5 +-
 arch/x86/kernel/asm-offsets_32.c                   |   2 +-
 arch/x86/kernel/asm-offsets_64.c                   |  10 +-
 arch/x86/kernel/traps.c                            |   2 +-
 arch/x86/um/sys_call_table_32.c                    |   4 +-
 arch/x86/um/sys_call_table_64.c                    |   7 +-
 arch/x86/um/user-offsets.c                         |   6 +-
 tools/testing/selftests/x86/Makefile               |  13 +-
 .../selftests/x86/check_initial_reg_state.c        | 108 +++++++++
 17 files changed, 330 insertions(+), 278 deletions(-)
 create mode 100644 tools/testing/selftests/x86/check_initial_reg_state.c

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2.5.0