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kgdb: Turn off tracing while in the debugger

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The kernel debugger should turn off kernel tracing any time the
debugger is active and restore it on resume.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jason Wessel
2010-04-02 11:57:18 -05:00
parent ae6bf53e02
commit 4da75b9cea
1 changed files with 8 additions and 0 deletions
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8
kernel/kgdb.c
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@@ -1365,6 +1365,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
int sstep_tries = 100; int sstep_tries = 100;
int error = 0; int error = 0;
int i, cpu; int i, cpu;
int trace_on = 0;
acquirelock: acquirelock:
/* /*
* Interrupts will be restored by the 'trap return' code, except when * Interrupts will be restored by the 'trap return' code, except when
@@ -1399,6 +1400,8 @@ return_normal:
*/ */
if (arch_kgdb_ops.correct_hw_break) if (arch_kgdb_ops.correct_hw_break)
arch_kgdb_ops.correct_hw_break(); arch_kgdb_ops.correct_hw_break();
if (trace_on)
tracing_on();
atomic_dec(&cpu_in_kgdb[cpu]); atomic_dec(&cpu_in_kgdb[cpu]);
touch_softlockup_watchdog_sync(); touch_softlockup_watchdog_sync();
clocksource_touch_watchdog(); clocksource_touch_watchdog();
@@ -1474,6 +1477,9 @@ return_normal:
kgdb_single_step = 0; kgdb_single_step = 0;
kgdb_contthread = current; kgdb_contthread = current;
exception_level = 0; exception_level = 0;
trace_on = tracing_is_on();
if (trace_on)
tracing_off();
/* Talk to debugger with gdbserial protocol */ /* Talk to debugger with gdbserial protocol */
error = gdb_serial_stub(ks); error = gdb_serial_stub(ks);
@@ -1505,6 +1511,8 @@ kgdb_restore:
else else
kgdb_sstep_pid = 0; kgdb_sstep_pid = 0;
} }
if (trace_on)
tracing_on();
/* Free kgdb_active */ /* Free kgdb_active */
atomic_set(&kgdb_active, -1); atomic_set(&kgdb_active, -1);
touch_softlockup_watchdog_sync(); touch_softlockup_watchdog_sync();