From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Sun, 13 May 2007 21:26:02 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: [Adeos-main] [PATCH 1/2] Perform panic traces only once
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To: Philippe Gerum <rpm@xenomai.org>
Cc: adeos-main <adeos-main@gna.org>

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Make sure that only the first panic trace gets frozen and that it is
only dumped once until being reset by turning ipipe_trace_enable on
again. This avoids troubles when multiple ipipe_trace_panic_freeze are
called until the related ipipe_trace_panic_dump has been invoked.
Required for the succeeding patch, but also of generic usefulness IMO.

Jan

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---
 kernel/ipipe/tracer.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux-2.6.20/kernel/ipipe/tracer.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- linux-2.6.20.orig/kernel/ipipe/tracer.c
+++ linux-2.6.20/kernel/ipipe/tracer.c
@@ -566,6 +566,9 @@ void ipipe_trace_panic_freeze(void)
 	unsigned long flags;
 	int cpu_id;
=20
+	if (!ipipe_trace_enable)
+		return;
+
 	ipipe_trace_enable =3D 0;
 	local_irq_save_hw_notrace(flags);
=20
@@ -615,6 +618,9 @@ void ipipe_trace_panic_dump(void)
 	int start, pos;
 	char task_info[12];
=20
+	if (!panic_path)
+		return;
+
 	printk("I-pipe tracer log (%d points):\n", cnt);
=20
 	start =3D pos =3D WRAP_POINT_NO(panic_path->trace_pos-1);
@@ -668,6 +674,8 @@ void ipipe_trace_panic_dump(void)
 		}
 		pos =3D WRAP_POINT_NO(pos - 1);
 	}
+
+	panic_path =3D NULL;
 }
 EXPORT_SYMBOL(ipipe_trace_panic_dump);
=20

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