linux-kernel - Re: v3.13-rc6+ regression (ARM board)

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Message-ID: <CA+55aFyZ0EXYkHd-BhQo6K++qKJVPdGeDbFTVTs3pAPCHFUpOA@mail.gmail.com>
Date:	Thu, 2 Jan 2014 11:38:56 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Krzysztof Hałasa <khalasa@...p.pl>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Willy Tarreau <w@....eu>,
	John Stultz <john.stultz@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: v3.13-rc6+ regression (ARM board)

On Thu, Jan 2, 2014 at 4:07 AM, Krzysztof Hałasa <khalasa@...p.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
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