Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / arch / x86 / kernel / reboot.c

diff --git a/kernel/arch/x86/kernel/reboot.c b/kernel/arch/x86/kernel/reboot.c
index f660d63..8384207 100644 (file)
--- a/kernel/arch/x86/kernel/reboot.c
+++ b/kernel/arch/x86/kernel/reboot.c
@@ -726,6 +726,7 @@ static int crashing_cpu;
 static nmi_shootdown_cb shootdown_callback;
 
 static atomic_t waiting_for_crash_ipi;
+static int crash_ipi_issued;
 
 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
 {
@@ -788,6 +789,9 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 
        smp_send_nmi_allbutself();
 
+       /* Kick CPUs looping in NMI context. */
+       WRITE_ONCE(crash_ipi_issued, 1);
+
        msecs = 1000; /* Wait at most a second for the other cpus to stop */
        while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
                mdelay(1);
@@ -796,6 +800,22 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 
        /* Leave the nmi callback set */
 }
+
+/* Override the weak function in kernel/panic.c */
+void nmi_panic_self_stop(struct pt_regs *regs)
+{
+       while (1) {
+               /*
+                * Wait for the crash dumping IPI to be issued, and then
+                * call its callback directly.
+                */
+               if (READ_ONCE(crash_ipi_issued))
+                       crash_nmi_callback(0, regs); /* Don't return */
+
+               cpu_relax();
+       }
+}
+
 #else /* !CONFIG_SMP */
 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 {