[PATCH v4 0/4] tracing: tweaks for generic syscall events

[Josh Stone <jistone@redhat.com>]

This patch series moves the callbacks for the syscall tracepoints to the
definition site, and adds generic TRACE_EVENTs which capture all syscall
arguments.

New in v3:
- Give the thread flag a more generic name: TIF_SYSCALL_TRACEPOINT.
- Move the regfuncs to arch-specific files, per Jason's suggestion.
- Change _WITH_CALLBACK to just _FN, per Ingo's suggestion.

New in v4:
- Give the config flag a more generic name: HAVE_SYSCALL_TRACEPOINTS.
- Undo the arch reorg of the regfuncs, but conditionalize on above.


Sample trace output:
        sendmail-974   [000] 55665.464492: sys_enter: NR 14 (1, 7fff60f3af40, 7fff60f3aec0, 8, 0, 7fb1b6a05161)

        sendmail-974   [000] 55665.464496: sys_exit: NR 14 = 0

        sendmail-974   [000] 55665.464507: sys_enter: NR 23 (5, 7fff60f3b0d0, 0, 0, 7fff60f3b150, 7fff60f3ef01)

            sshd-978   [000] 55667.845359: sys_exit: NR 23 = 1

            sshd-978   [000] 55667.845373: sys_enter: NR 14 (0, 7fffc645ce90, 7fffc645cf10, 8, 0, 101010101010101)

            sshd-978   [000] 55667.845381: sys_exit: NR 14 = 0

            sshd-978   [000] 55667.845383: sys_enter: NR 14 (2, 7fffc645cf10, 0, 8, 0, 101010101010101)

            sshd-978   [000] 55667.845386: sys_exit: NR 14 = 0

            sshd-978   [000] 55667.845395: sys_enter: NR 0 (3, 7fffc6458f80, 4000, 1, 0, 0)

            sshd-978   [000] 55667.845478: sys_exit: NR 0 = 48


Signed-off-by: Josh Stone <jistone@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Paul Mundt <lethal@linux-sh.org>
---
 arch/s390/Kconfig                   |    2 +-
 arch/s390/defconfig                 |    2 +-
 arch/s390/include/asm/thread_info.h |    4 +-
 arch/s390/kernel/entry.S            |    2 +-
 arch/s390/kernel/entry64.S          |    2 +-
 arch/s390/kernel/ptrace.c           |   12 +++---
 arch/x86/Kconfig                    |    2 +-
 arch/x86/configs/i386_defconfig     |    2 +-
 arch/x86/configs/x86_64_defconfig   |    2 +-
 arch/x86/include/asm/thread_info.h  |   13 +++---
 arch/x86/kernel/ptrace.c            |   16 +++----
 include/linux/tracepoint.h          |   46 +++++++++--------------
 include/trace/define_trace.h        |    5 ++
 include/trace/events/syscalls.h     |   70 +++++++++++++++++++++++++++++++++++
 include/trace/ftrace.h              |    9 ++++
 include/trace/syscall.h             |   17 --------
 kernel/trace/Kconfig                |    4 +-
 kernel/trace/trace_syscalls.c       |   17 ++++----
 kernel/tracepoint.c                 |   20 ++++++----