Re: [linux-next][regression] [PATCH] percpu: add preemption checks to __this_cpu ops

From: Christoph Lameter
Date: Thu Mar 20 2014 - 10:06:46 EST

On Tue, 18 Mar 2014, Andrew Morton wrote:

> > snprintf can cause hangs.
> This is weird. How the heck can snprintf() fail if called too early?
> All it does is shuffle chars around in memory. The only external
> dependency I'm seeing is a WARN_ON() which presumably didn't trigger
> anyway.
> I'm suspecting a misdiagnosis here. Otherwise, we seriously need to
> fix snprintf(), not work around it!
> Also, what does "before checking error conditions" refer to? Does this
> mean you know why snprintf() failed??

No I dont. I only know that this fixes Grygorii's issues. There could be
numerous arch specific per cpu setup issues going on that may impact on

If I move it behind the checks then I can avoid using snprintf.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at