[PATCH v2 6/7] ia64, kdump: Try INIT regardless of kdump_on_init

[Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>]

CPUs should be frozen if possible, otherwise it might hinder kdump.
So if there are CPUs not respond to IPI, try INIT to stop them.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Haren Myneni <hbabu@us.ibm.com>
Cc: kexec@lists.infradead.org
---
 arch/ia64/kernel/crash.c |   43 +++++++++++++++++++++----------------------
 1 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
index 9c851b7..0995fdc 100644
--- a/arch/ia64/kernel/crash.c
+++ b/arch/ia64/kernel/crash.c
@@ -138,8 +138,10 @@ machine_crash_shutdown(struct pt_regs *pt)
 	 */
 	kdump_smp_send_stop();
 	/* not all cpu response to IPI, send INIT to freeze them */
-	if (kdump_wait_cpu_freeze() && kdump_on_init) 	{
+	if (kdump_wait_cpu_freeze()) {
 		kdump_smp_send_init();
+		/* wait again, don't go ahead if possible */
+		kdump_wait_cpu_freeze();
 	}
 #endif
 }
@@ -178,6 +180,19 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
 	struct ia64_mca_notify_die *nd;
 	struct die_args *args = data;
 
+	if (atomic_read(&kdump_in_progress)) {
+		switch (val) {
+		case DIE_INIT_MONARCH_LEAVE:
+			if (!kdump_freeze_monarch)
+				break;
+			/* fall through */
+		case DIE_INIT_SLAVE_LEAVE:
+		case DIE_MCA_RENDZVOUS_LEAVE:
+			unw_init_running(kdump_cpu_freeze, NULL);
+			break;
+		}
+	}
+
 	if (!kdump_on_init && !kdump_on_fatal_mca)
 		return NOTIFY_DONE;
 
@@ -190,41 +205,25 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
 	}
 
 	if (val != DIE_INIT_MONARCH_LEAVE &&
-	    val != DIE_INIT_SLAVE_LEAVE &&
 	    val != DIE_INIT_MONARCH_PROCESS &&
-	    val != DIE_MCA_RENDZVOUS_LEAVE &&
 	    val != DIE_MCA_MONARCH_LEAVE)
 		return NOTIFY_DONE;
 
 	nd = (struct ia64_mca_notify_die *)args->err;
-	/* Reason code 1 means machine check rendezvous*/
-	if ((val == DIE_INIT_MONARCH_LEAVE || val == DIE_INIT_SLAVE_LEAVE
-	    || val == DIE_INIT_MONARCH_PROCESS) && nd->sos->rv_rc == 1)
-		return NOTIFY_DONE;
 
 	switch (val) {
 	case DIE_INIT_MONARCH_PROCESS:
-		if (kdump_on_init) {
+		/* Reason code 1 means machine check rendezvous*/
+		if (kdump_on_init && (nd->sos->rv_rc != 1)) {
 			if (atomic_inc_return(&kdump_in_progress) != 1)
 				kdump_freeze_monarch = 1;
 			*(nd->monarch_cpu) = -1;
 		}
 		break;
 	case DIE_INIT_MONARCH_LEAVE:
-		if (kdump_on_init) {
-			if (kdump_freeze_monarch)
-				unw_init_running(kdump_cpu_freeze, NULL);
-			else
-				machine_kdump_on_init();
-		}
-		break;
-	case DIE_INIT_SLAVE_LEAVE:
-		if (atomic_read(&kdump_in_progress))
-			unw_init_running(kdump_cpu_freeze, NULL);
-		break;
-	case DIE_MCA_RENDZVOUS_LEAVE:
-		if (atomic_read(&kdump_in_progress))
-			unw_init_running(kdump_cpu_freeze, NULL);
+		/* Reason code 1 means machine check rendezvous*/
+		if (kdump_on_init && (nd->sos->rv_rc != 1))
+			machine_kdump_on_init();
 		break;
 	case DIE_MCA_MONARCH_LEAVE:
 		/* *(nd->data) indicate if MCA is recoverable */
-- 
1.6.0