linux-kernel - Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups

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Date:   Fri, 23 Jun 2017 23:50:25 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Don Zickus <dzickus@...hat.com>
cc:     Kan Liang <kan.liang@...el.com>, linux-kernel@...r.kernel.org,
        mingo@...nel.org, akpm@...ux-foundation.org, babu.moger@...cle.com,
        atomlin@...hat.com, prarit@...hat.com,
        torvalds@...ux-foundation.org, peterz@...radead.org,
        eranian@...gle.com, acme@...hat.com, ak@...ux.intel.com,
        stable@...r.kernel.org
Subject: Re: [PATCH V2] kernel/watchdog: fix spurious hard lockups

On Fri, 23 Jun 2017, Don Zickus wrote:
> Hmm, all this work for a temp fix.  Kan, how much longer until the real fix
> of having perf count the right cycles?

Quite a while. The approach is wilfully breaking the user space ABI, which
is not going to happen.

And there is a simpler solution as well, as I said here:

    http://lkml.kernel.org/r/alpine.DEB.2.20.1706221730520.1885@nanos

Thanks,

	tglx