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[IA64-SGI] ignoring loss of heartbeat while XPC is in kdebug 

Allow for the loss of heartbeat while in kdebug to be ignored by remote
partitions.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Dean Nelson 2006-01-10 11:08:00 -06:00 committed by Tony Luck
parent 0752c670d8
commit 1f4674b2d5
1 changed files with 27 additions and 1 deletions
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28
arch/ia64/sn/kernel/xpc_main.c
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@ -82,6 +82,9 @@ struct device *xpc_part = &xpc_part_dbg_subname;
struct device *xpc_chan = &xpc_chan_dbg_subname;
static int xpc_kdebug_ignore;
/* systune related variables for /proc/sys directories */
static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
@ -1148,7 +1151,12 @@ xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
/*
* This function is called when the system is being rebooted.
* This function is called when the system is being restarted or halted due
* to some sort of system failure. If this is the case we need to notify the
* other partitions to disengage from all references to our memory.
* This function can also be called when our heartbeater could be offlined
* for a time. In this case we need to notify other partitions to not worry
* about the lack of a heartbeat.
*/
static int
xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
@ -1158,11 +1166,25 @@ xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
case DIE_MACHINE_HALT:
xpc_die_disengage();
break;
case DIE_KDEBUG_ENTER:
/* Should lack of heartbeat be ignored by other partitions? */
if (!xpc_kdebug_ignore) {
break;
}
/* fall through */
case DIE_MCA_MONARCH_ENTER:
case DIE_INIT_MONARCH_ENTER:
xpc_vars->heartbeat++;
xpc_vars->heartbeat_offline = 1;
break;
case DIE_KDEBUG_LEAVE:
/* Is lack of heartbeat being ignored by other partitions? */
if (!xpc_kdebug_ignore) {
break;
}
/* fall through */
case DIE_MCA_MONARCH_LEAVE:
case DIE_INIT_MONARCH_LEAVE:
xpc_vars->heartbeat++;
@ -1387,3 +1409,7 @@ module_param(xpc_disengage_request_timelimit, int, 0);
MODULE_PARM_DESC(xpc_disengage_request_timelimit, "Number of seconds to wait "
"for disengage request to complete.");
module_param(xpc_kdebug_ignore, int, 0);
MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
"other partitions when dropping into kdebug.");