[PATCH 20/20] kdb-clocksource-resync

[joe.korty@xxxxxxxx]

Fix up the clocksource watchdog whenever we leave KDB.

Without this fixup, the TSC will be marked unstable
whenever we leave KDB after being in KDB for 'too long'
(tens of seconds).  This is an undesireable system
interaction with a measurement tool, as being marked
unstable means the system has removed the TSC as a source
of system time.

Typical message:

    [3]kdb> g
    Clocksource tsc unstable (delta = 4687003347 ns)

Signed-off-by: Joe Korty <joe.korty@xxxxxxxx>

Index: 2.6.26-rc9/kdb/kdbmain.c
===================================================================
--- 2.6.26-rc9.orig/kdb/kdbmain.c       2008-07-10 18:31:11.000000000 -0400
+++ 2.6.26-rc9/kdb/kdbmain.c    2008-07-11 11:46:18.000000000 -0400
@@ -40,6 +40,7 @@
 #include <linux/dump.h>
 #endif
 #include <linux/cpu.h>
+#include <linux/clocksource.h>
 #include <linux/kdebug.h>
 
 #include <acpi/acpi_bus.h>
@@ -2122,6 +2123,7 @@
                        kdbnearsym_cleanup();
                        debug_kusage();
                }
+               clocksource_touch_watchdog();
                if (!KDB_STATE(GO1)) {
                        /*
                         * Release all other cpus which will see 
KDB_STATE(LEAVING) is set.
---------------------------
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