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Commit 1f4674b2 authored by Dean Nelson's avatar Dean Nelson Committed by Tony Luck
Browse files

[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: default avatarDean Nelson <dcn@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 0752c670

arch/ia64/sn/kernel/xpc_main.c

+27 −1
Original line number Diff line number Diff line
@@ -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.");