Hello Fengguang
On Fri, Feb 8, 2013 at 10:06 AM, Fengguang Wu <fengguang...@intel.com> wrote:
> [ 0.000000] Console: colour VGA+ 80x25
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at /c/kernel-tests/src/linux/kernel/sched/clock.c:219
> sched_clock_cpu+0x65/0x140()
> [ 0.000000] Hardware name: Bochs
> [ 0.000000] Modules linked in:
> [ 0.000000] Pid: 0, comm: swapper Not tainted 3.8.0-rc6-mm1-00539-g83b324c
> #39
> [ 0.000000] Call Trace:
> [ 0.000000] [<c102ba37>] warn_slowpath_common+0x87/0xb0
> [ 0.000000] [<c1063025>] ? sched_clock_cpu+0x65/0x140
> [ 0.000000] [<c1063025>] ? sched_clock_cpu+0x65/0x140
> [ 0.000000] [<c102ba82>] warn_slowpath_null+0x22/0x30
> [ 0.000000] [<c1063025>] sched_clock_cpu+0x65/0x140
> [ 0.000000] [<c102d8f9>] __console_unlock+0x39/0x490
> [ 0.000000] [<c12eeb23>] ? printk+0x3d/0x3f
> [ 0.000000] [<c102dd5d>] console_unlock+0xd/0x20
> [ 0.000000] [<c14bbbb0>] con_init+0x1fb/0x20e
> [ 0.000000] [<c14bb1b2>] console_init+0x12/0x20
> [ 0.000000] [<c149e969>] start_kernel+0x258/0x35f
> [ 0.000000] [<c149e4cc>] ? repair_env_string+0x51/0x51
> [ 0.000000] [<c149e376>] i386_start_kernel+0x12c/0x12f
> [ 0.000000] ---[ end trace e006f8c3d589c9a1 ]---
>
Can you please try the following fix?
--- a/kernel/printk.c Fri Feb 8 12:31:18 2013
+++ b/kernel/printk.c Fri Feb 8 12:51:42 2013
@@ -2053,6 +2053,7 @@ static bool __console_unlock(void)
return false;
}
+ local_irq_save(flags);
console_may_schedule = 0;
cur_cpu = smp_processor_id();
/*
@@ -2062,6 +2063,7 @@ static bool __console_unlock(void)
end_time = sched_clock_cpu(cur_cpu) +
max_interrupt_disabled_duration() / 2;
+ local_irq_restore(flags);
/* flush buffered message fragment immediately to console */
console_cont_flush(text, sizeof(text));
again:
--
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