vserver 2.0 rc7

[linux-2.6.git] / arch / s390 / kernel / s390_ext.c

diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c
index b61490b..3bdd38e 100644 (file)
--- a/arch/s390/kernel/s390_ext.c
+++ b/arch/s390/kernel/s390_ext.c
@@ -114,6 +114,10 @@ void do_extint(struct pt_regs *regs, unsigned short code)
        irq_enter();
        asm volatile ("mc 0,0");
        if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
+               /**
+                * Make sure that the i/o interrupt did not "overtake"
+                * the last HZ timer interrupt.
+                */
                account_ticks(regs);
        kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
         index = code & 0xff;