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    Subject[PATCH 28/28] debug_core: Turn off tracing while in the debugger
    Date
    The kernel debugger should turn off kernel tracing any time the
    debugger is active and restore it on resume.

    CC: Steven Rostedt <rostedt@goodmis.org>
    Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
    ---
    kernel/debug/debug_core.c | 8 ++++++++
    1 files changed, 8 insertions(+), 0 deletions(-)

    diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
    index 580fc3b..f7ebb7f 100644
    --- a/kernel/debug/debug_core.c
    +++ b/kernel/debug/debug_core.c
    @@ -474,6 +474,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
    int sstep_tries = 100;
    int error;
    int i, cpu;
    + int trace_on = 0;
    acquirelock:
    /*
    * Interrupts will be restored by the 'trap return' code, except when
    @@ -518,6 +519,8 @@ return_normal:
    */
    if (arch_kgdb_ops.correct_hw_break)
    arch_kgdb_ops.correct_hw_break();
    + if (trace_on)
    + tracing_on();
    atomic_set(&cpu_in_kgdb[cpu], 0);
    touch_softlockup_watchdog_sync();
    clocksource_touch_watchdog();
    @@ -592,6 +595,9 @@ return_normal:
    kgdb_single_step = 0;
    kgdb_contthread = current;
    exception_level = 0;
    + trace_on = tracing_is_on();
    + if (trace_on)
    + tracing_off();

    while (1) {
    cpu_master_loop:
    @@ -645,6 +651,8 @@ kgdb_restore:
    else
    kgdb_sstep_pid = 0;
    }
    + if (trace_on)
    + tracing_on();
    /* Free kgdb_active */
    atomic_set(&kgdb_active, -1);
    touch_softlockup_watchdog_sync();
    --
    1.6.4.rc1


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