linux-kernel - Re: [GIT pull] CPU hotplug updates for 4.9

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Date:   Wed, 8 Mar 2017 09:25:16 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Bart Van Assche <Bart.VanAssche@...disk.com>
cc:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [GIT pull] CPU hotplug updates for 4.9

Bart,

On Tue, 7 Mar 2017, Bart Van Assche wrote:
> On Tue, 2017-03-07 at 10:30 +0100, Thomas Gleixner wrote:
> > That's odd. There was no change related to the hotplug stuff post 4.10
> > neither in the core nor in that particular driver.
> > 
> > I have no immediate clue what to look for aside of asking you whether you
> > could do a bisect between 4.10 and 4.11-rc1.
> 
> I will keep trying to find the commit that introduced this behavior. The
> bisect I ran this morning yielded a commit that only changes ARM code which
> does not make sense since I ran the bisect on an x86 system. I guess that
> means that during one of the bisect steps I did not wait long enough to see
> whether or not the hang occurs and hence that I provided incorrect input to
> the bisect process.

Before you proceed with bisecting, could you try Linus head first,
especially commit:

fa3aa7a54fe6 ("jiffies: Revert bogus conversion of NSEC_PER_SEC to TICK_NSEC")

which fixes: 93825f2ec736 ("jiffies: Reuse TICK_NSEC instead of NSEC_PER_JIFFY")

Thanks,

	tglx