Merge tag 'v4.13-rc1' into fixes

[karo-tx-linux.git] / arch / powerpc / kernel / smp.c

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index b0ea6d4d4853c90f63db6d0c2da8d8202bebacf4..cf0e1245b8cc1c78948a4004be2d20c5b5ac0b78 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -435,13 +435,31 @@ static void do_smp_send_nmi_ipi(int cpu)
        }
 }
 
+void smp_flush_nmi_ipi(u64 delay_us)
+{
+       unsigned long flags;
+
+       nmi_ipi_lock_start(&flags);
+       while (nmi_ipi_busy_count) {
+               nmi_ipi_unlock_end(&flags);
+               udelay(1);
+               if (delay_us) {
+                       delay_us--;
+                       if (!delay_us)
+                               return;
+               }
+               nmi_ipi_lock_start(&flags);
+       }
+       nmi_ipi_unlock_end(&flags);
+}
+
 /*
  * - cpu is the target CPU (must not be this CPU), or NMI_IPI_ALL_OTHERS.
  * - fn is the target callback function.
  * - delay_us > 0 is the delay before giving up waiting for targets to
  *   enter the handler, == 0 specifies indefinite delay.
  */
-static int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
+int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us)
 {
        unsigned long flags;
        int me = raw_smp_processor_id();