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From: Jason Wessel on 12 Feb 2010 17:40
The kernel debugger should turn off kernel tracing any time the
debugger is active and restore it on resume.

CC: Steven Rostedt <rostedt(a)goodmis.org>
Signed-off-by: Jason Wessel <jason.wessel(a)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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Next: [PATCH 04/28] kgdb,sparc: Add in kgdb_arch_set_pc for sparc