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    Subject[patch-early-RFC 05/10] LTTng instrumentation PPC
    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    ---
    arch/ppc/kernel/misc.S | 2 +-
    arch/ppc/kernel/time.c | 4 ++++
    arch/ppc/kernel/traps.c | 3 +++
    arch/ppc/mm/fault.c | 3 +++
    4 files changed, 11 insertions(+), 1 deletion(-)

    Index: linux-2.6-lttng/arch/ppc/kernel/misc.S
    ===================================================================
    --- linux-2.6-lttng.orig/arch/ppc/kernel/misc.S 2007-11-13 09:25:23.000000000 -0500
    +++ linux-2.6-lttng/arch/ppc/kernel/misc.S 2007-11-13 09:50:11.000000000 -0500
    @@ -868,7 +868,7 @@ _GLOBAL(_get_SP)
    * Create a kernel thread
    * kernel_thread(fn, arg, flags)
    */
    -_GLOBAL(kernel_thread)
    +_GLOBAL(original_kernel_thread)
    stwu r1,-16(r1)
    stw r30,8(r1)
    stw r31,12(r1)
    Index: linux-2.6-lttng/arch/ppc/kernel/time.c
    ===================================================================
    --- linux-2.6-lttng.orig/arch/ppc/kernel/time.c 2007-11-13 09:25:23.000000000 -0500
    +++ linux-2.6-lttng/arch/ppc/kernel/time.c 2007-11-13 09:50:11.000000000 -0500
    @@ -139,7 +139,10 @@ void timer_interrupt(struct pt_regs * re
    if (atomic_read(&ppc_n_lost_interrupts) != 0)
    do_IRQ(regs);

    + trace_mark(kernel_arch_trap_entry, "trap_id %ld ip #p%ld",
    + regs->trap, instruction_pointer(regs));
    old_regs = set_irq_regs(regs);
    +
    irq_enter();

    while ((next_dec = tb_ticks_per_jiffy - tb_delta(&jiffy_stamp)) <= 0) {
    @@ -192,6 +195,7 @@ void timer_interrupt(struct pt_regs * re

    irq_exit();
    set_irq_regs(old_regs);
    + trace_mark(kernel_arch_trap_exit, MARK_NOARGS);
    }

    /*
    Index: linux-2.6-lttng/arch/ppc/kernel/traps.c
    ===================================================================
    --- linux-2.6-lttng.orig/arch/ppc/kernel/traps.c 2007-11-13 09:25:23.000000000 -0500
    +++ linux-2.6-lttng/arch/ppc/kernel/traps.c 2007-11-13 09:50:11.000000000 -0500
    @@ -108,11 +108,14 @@ void _exception(int signr, struct pt_reg
    debugger(regs);
    die("Exception in kernel mode", regs, signr);
    }
    + trace_mark(kernel_arch_trap_entry, "trap_id %ld ip #p%ld", regs->trap,
    + instruction_pointer(regs));
    info.si_signo = signr;
    info.si_errno = 0;
    info.si_code = code;
    info.si_addr = (void __user *) addr;
    force_sig_info(signr, &info, current);
    + trace_mark(kernel_arch_trap_exit, MARK_NOARGS);

    /*
    * Init gets no signals that it doesn't have a handler for.
    Index: linux-2.6-lttng/arch/ppc/mm/fault.c
    ===================================================================
    --- linux-2.6-lttng.orig/arch/ppc/mm/fault.c 2007-11-13 09:25:23.000000000 -0500
    +++ linux-2.6-lttng/arch/ppc/mm/fault.c 2007-11-13 09:50:11.000000000 -0500
    @@ -250,7 +250,10 @@ good_area:
    * the fault.
    */
    survive:
    + trace_mark(kernel_arch_trap_entry, "trap_id %ld ip #p%ld",
    + regs->trap, instruction_pointer(regs));
    fault = handle_mm_fault(mm, vma, address, is_write);
    + trace_mark(kernel_arch_trap_exit, MARK_NOARGS);
    if (unlikely(fault & VM_FAULT_ERROR)) {
    if (fault & VM_FAULT_OOM)
    goto out_of_memory;
    --
    Mathieu Desnoyers
    Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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