---

yaml
---
r: 196668
b: refs/heads/master
c: 60adec6
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1fc711f7ffb01089efc58042cfdbac8573d1b59a
+refs/heads/master: 60adec6226bbcf061d4c2d10944fced209d1847d

trunk/arch/powerpc/kernel/crash.c

@@ -162,6 +162,32 @@ static void crash_kexec_prepare_cpus(int cpu)
 	/* Leave the IPI callback set */
 }
 
+/* wait for all the CPUs to hit real mode but timeout if they don't come in */
+static void crash_kexec_wait_realmode(int cpu)
+{
+	unsigned int msecs;
+	int i;
+
+	msecs = 10000;
+	for (i=0; i < NR_CPUS && msecs > 0; i++) {
+		if (i == cpu)
+			continue;
+
+		while (paca[i].kexec_state < KEXEC_STATE_REAL_MODE) {
+			barrier();
+			if (!cpu_possible(i)) {
+				break;
+			}
+			if (!cpu_online(i)) {
+				break;
+			}
+			msecs--;
+			mdelay(1);
+		}
+	}
+	mb();
+}
+
 /*
  * This function will be called by secondary cpus or by kexec cpu
  * if soft-reset is activated to stop some CPUs.
@@ -419,6 +445,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
 	crash_kexec_prepare_cpus(crashing_cpu);
 	cpu_set(crashing_cpu, cpus_in_crash);
 	crash_kexec_stop_spus();
+	crash_kexec_wait_realmode(crashing_cpu);
 	if (ppc_md.kexec_cpu_down)
 		ppc_md.kexec_cpu_down(1, 0);
 }