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Commit 4da75b9c authored by Jason Wessel's avatar Jason Wessel
Browse files

kgdb: Turn off tracing while in the debugger 



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

Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
Reviewed-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent ae6bf53e

kernel/kgdb.c

+8 −0
Original line number Diff line number Diff line
@@ -1365,6 +1365,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs) 
	int sstep_tries = 100;

	int error = 0;

	int i, cpu;

	int trace_on = 0;

acquirelock:

	/*

	 * Interrupts will be restored by the 'trap return' code, except when
@@ -1399,6 +1400,8 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs) 
			 */

			if (arch_kgdb_ops.correct_hw_break)

				arch_kgdb_ops.correct_hw_break();

			if (trace_on)

				tracing_on();

			atomic_dec(&cpu_in_kgdb[cpu]);

			touch_softlockup_watchdog_sync();

			clocksource_touch_watchdog();
@@ -1474,6 +1477,9 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs) 
	kgdb_single_step = 0;

	kgdb_contthread = current;

	exception_level = 0;

	trace_on = tracing_is_on();

	if (trace_on)

		tracing_off();



	/* Talk to debugger with gdbserial protocol */

	error = gdb_serial_stub(ks);
@@ -1505,6 +1511,8 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs) 
		else

			kgdb_sstep_pid = 0;

	}

	if (trace_on)

		tracing_on();

	/* Free kgdb_active */

	atomic_set(&kgdb_active, -1);

	touch_softlockup_watchdog_sync();