v3.13-rc6+ regression (ARM board)

[Linus Torvalds]

On Thu, Jan 2, 2014 at 4:07 AM, Krzysztof Hałasa <khalasa at piap.pl> wrote:
>
> This means these two commits don't like each other:
>
>     seqcount: Add lockdep functionality to seqcount/seqlock structures
>     sched_clock: Use seqcount instead of rolling our own

Does something like this fix it for you?

  --- a/kernel/time/sched_clock.c
  +++ b/kernel/time/sched_clock.c
  @@ -36,6 +36,7 @@ core_param(irqtime, irqtime, int, 0400);

   static struct clock_data cd = {
          .mult   = NSEC_PER_SEC / HZ,
  +       .seq = SEQCNT_ZERO(cd.seq),
   };

   static u64 __read_mostly sched_clock_mask;

(The above is not even compile-tested, because x86 doesn't use
GENERIC_SCHED_CLOCK. So I did the patch blindly, but I think you get
the idea..)

            Linus