[PATCH v4 0/4] ptrace: cleanup PTRACE_SYSEMU handling and add support for arm64

[Sudeep Holla]

Hi,

This patchset evolved from the discussion in the thread[0][1]. When we
wanted to add PTRACE_SYSEMU support to ARM64, we thought instead of
duplicating what other architectures like x86 and powerpc have done,
let consolidate the existing support and move it to the core as there's
nothing arch specific in it.

v3->v4:
	- Rebased on v5.2-rc1
	- Added Oleg's acks for generic and x86 parts

v2->v3:
	- moved clearing of TIF_SYSCALL_EMU to __ptrace_unlink as Oleg
	  suggested
	- x86 cleanup as per Oleg's suggestion and dropped adding new
	  ptrace_syscall_enter for SYSEMU handling
	  (tested using tools/testing/selftests/x86/ptrace_syscall.c)
	- Updated arm64 handling accordingly

v1->v2:
	- added comment for empty statement after tracehook_report_syscall_entry
	- dropped x86 change in syscall_slow_exit_work as I had ended
	  up changing logic unintentionally
	- removed spurious change in powerpc moving user_exit()

Regards,
Sudeep

[0] https://patchwork.kernel.org/patch/10585505/
[1] https://patchwork.kernel.org/patch/10675237/

Sudeep Holla (4):
  ptrace: move clearing of TIF_SYSCALL_EMU flag to core
  x86: simplify _TIF_SYSCALL_EMU handling
  arm64: add PTRACE_SYSEMU{,SINGLESTEP} definations to uapi headers
  arm64: ptrace: add support for syscall emulation

 arch/arm64/include/asm/thread_info.h |  5 ++++-
 arch/arm64/include/uapi/asm/ptrace.h |  3 +++
 arch/arm64/kernel/ptrace.c           |  6 +++++-
 arch/powerpc/kernel/ptrace.c         |  1 -
 arch/x86/entry/common.c              | 17 ++++++-----------
 arch/x86/kernel/ptrace.c             |  3 ---
 kernel/ptrace.c                      |  3 +++
 7 files changed, 21 insertions(+), 17 deletions(-)

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2.17.1