[PATCH v4 0/3] arm64: prerequisites for audit and ftrace

This patchset contains some patches commonly applied for audit and ftrace. Patch [1/3] defines syscall trace related TIF_* flags in order to add hooks, including ftrace, audit and seccomp, later on. Those features will be implemented in separate patchsets, but it's safe to check for all TIF_* now because they can not be turned on anyway. Patch [2/3] doesn't change a behavior but make it easy and manageable to confirm we invoke those hooks in correct order by splitting syscall_trace(). Patch [3/3] adds a commonly used function, which returns a return value of system call. Changes v3 -> v4: * added "arm64: split syscall_trace() into separate functions for enter/ exit", which is just a preparation for adding syscall trace hooks later. Changes v2 -> v3: * reverted a change in syscall_trace() in v1 [1/2] * added "arm64: Add regs_return_value() in syscall.h" patch which was previously included in audit patch [2/2] Changes v1 -> v2: * added a guard against TIF_SYSCALL_TRACE at tracehook_report_syscall_*() * renamed _TIF_WORK_SYSCALL to _TIF_SYSCALL_WORK AKASHI Takahiro (3): arm64: make a single hook to syscall_trace() for all syscall features arm64: split syscall_trace() into separate functions for enter/exit arm64: Add regs_return_value() in syscall.h arch/arm64/include/asm/ptrace.h | 5 ++++ arch/arm64/include/asm/thread_info.h | 13 +++++++++ arch/arm64/kernel/entry.S | 15 +++++------ arch/arm64/kernel/ptrace.c | 48 ++++++++++++++++++++++++++-------- 4 files changed, 62 insertions(+), 19 deletions(-) -- 1.7.9.5