Pull error-inject into release branch

[sfrench/cifs-2.6.git] / arch / ia64 / kernel / smp.c

diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
index 657ac99a451cf8d550e10d5fa52af12f130b3588..55ddd809b02d47aa72fc7b1f251c851aeffddc40 100644 (file)
--- a/arch/ia64/kernel/smp.c
+++ b/arch/ia64/kernel/smp.c
@@ -30,6 +30,7 @@
 #include <linux/delay.h>
 #include <linux/efi.h>
 #include <linux/bitops.h>
+#include <linux/kexec.h>
 
 #include <asm/atomic.h>
 #include <asm/current.h>
@@ -66,6 +67,7 @@ static volatile struct call_data_struct *call_data;
 
 #define IPI_CALL_FUNC          0
 #define IPI_CPU_STOP           1
+#define IPI_KDUMP_CPU_STOP     3
 
 /* This needs to be cacheline aligned because it is written to by *other* CPUs.  */
 static DEFINE_PER_CPU(u64, ipi_operation) ____cacheline_aligned;
@@ -108,7 +110,7 @@ cpu_die(void)
 }
 
 irqreturn_t
-handle_IPI (int irq, void *dev_id, struct pt_regs *regs)
+handle_IPI (int irq, void *dev_id)
 {
        int this_cpu = get_cpu();
        unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation);
@@ -155,7 +157,11 @@ handle_IPI (int irq, void *dev_id, struct pt_regs *regs)
                              case IPI_CPU_STOP:
                                stop_this_cpu();
                                break;
-
+#ifdef CONFIG_KEXEC
+                             case IPI_KDUMP_CPU_STOP:
+                               unw_init_running(kdump_cpu_freeze, NULL);
+                               break;
+#endif
                              default:
                                printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", this_cpu, which);
                                break;
@@ -213,6 +219,26 @@ send_IPI_self (int op)
        send_IPI_single(smp_processor_id(), op);
 }
 
+#ifdef CONFIG_KEXEC
+void
+kdump_smp_send_stop(void)
+{
+       send_IPI_allbutself(IPI_KDUMP_CPU_STOP);
+}
+
+void
+kdump_smp_send_init(void)
+{
+       unsigned int cpu, self_cpu;
+       self_cpu = smp_processor_id();
+       for_each_online_cpu(cpu) {
+               if (cpu != self_cpu) {
+                       if(kdump_status[cpu] == 0)
+                               platform_send_ipi(cpu, 0, IA64_IPI_DM_INIT, 0);
+               }
+       }
+}
+#endif
 /*
  * Called with preeemption disabled.
  */
@@ -328,10 +354,14 @@ int
 smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wait)
 {
        struct call_data_struct data;
-       int cpus = num_online_cpus()-1;
+       int cpus;
 
-       if (!cpus)
+       spin_lock(&call_lock);
+       cpus = num_online_cpus() - 1;
+       if (!cpus) {
+               spin_unlock(&call_lock);
                return 0;
+       }
 
        /* Can deadlock when called with interrupts disabled */
        WARN_ON(irqs_disabled());
@@ -343,8 +373,6 @@ smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wai
        if (wait)
                atomic_set(&data.finished, 0);
 
-       spin_lock(&call_lock);
-
        call_data = &data;
        mb();   /* ensure store to call_data precedes setting of IPI_CALL_FUNC */
        send_IPI_allbutself(IPI_CALL_FUNC);