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    Subject[RFC patch 08/20] LTTng Kernel Trace Thread Flag ia64
    Add a thread flag to activate system-wide syscall tracing.

    FIXME : Masami reported that enabling the KERNEL_TRACE thread flag did disable
    the gate page for gettimeofday, falling back on a standard system call. More
    work would be needed in this area and I don't have the architecture available.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    CC: Masami Hiramatsu <mhiramat@redhat.com>
    ---
    arch/ia64/include/asm/thread_info.h | 10 +++++++---
    arch/ia64/kernel/entry.S | 6 ++++--
    2 files changed, 11 insertions(+), 5 deletions(-)
    Index: linux-2.6-lttng/arch/ia64/include/asm/thread_info.h
    ===================================================================
    --- linux-2.6-lttng.orig/arch/ia64/include/asm/thread_info.h 2009-03-15 15:57:05.000000000 -0400
    +++ linux-2.6-lttng/arch/ia64/include/asm/thread_info.h 2009-03-15 15:57:15.000000000 -0400
    @@ -100,6 +100,7 @@ struct thread_info {
    #define TIF_SYSCALL_TRACE 2 /* syscall trace active */
    #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
    #define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
    +#define TIF_KERNEL_TRACE 5 /* kernel trace active */
    #define TIF_NOTIFY_RESUME 6 /* resumption notification requested */
    #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
    #define TIF_MEMDIE 17
    @@ -111,7 +112,9 @@ struct thread_info {
    #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
    #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
    #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
    -#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
    +#define _TIF_KERNEL_TRACE (1 << TIF_KERNEL_TRACE)
    +#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|\
    + _TIF_SINGLESTEP|_TIF_KERNEL_TRACE)
    #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
    #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
    #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
    @@ -124,8 +127,9 @@ struct thread_info {
    /* "work to do on user-return" bits */
    #define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
    _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
    -/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
    -#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
    +/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE, TIF_KERNEL_TRACE or TIF_SYSCALL_AUDIT */
    +#define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_KERNEL_TRACE|\
    + _TIF_SYSCALL_AUDIT))

    #define TS_POLLING 1 /* true if in idle loop and not sleeping */
    #define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
    Index: linux-2.6-lttng/arch/ia64/kernel/entry.S
    ===================================================================
    --- linux-2.6-lttng.orig/arch/ia64/kernel/entry.S 2009-03-15 15:57:05.000000000 -0400
    +++ linux-2.6-lttng/arch/ia64/kernel/entry.S 2009-03-15 15:57:15.000000000 -0400
    @@ -634,9 +634,11 @@ GLOBAL_ENTRY(ia64_ret_from_clone)
    ;;
    ld4 r2=[r2]
    ;;
    + movl r8=_TIF_SYSCALL_TRACEAUDIT
    + ;; // added stop bits to prevent r8 dependency
    + and r2=r8,r2
    mov r8=0
    - and r2=_TIF_SYSCALL_TRACEAUDIT,r2
    - ;;
    + ;; // added stop bits to prevent r2 dependency
    cmp.ne p6,p0=r2,r0
    (p6) br.cond.spnt .strace_check_retval
    ;; // added stop bits to prevent r8 dependency
    --
    Mathieu Desnoyers
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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