linux-kernel - Re: [x86-tip] strange nr

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Message-ID: <20160926134034.rbewdt7sbt2pzrwn@pd.tnic>
Date:   Mon, 26 Sep 2016 15:40:34 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Mike Galbraith <umgwanakikbuti@...il.com>
Cc:     Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [x86-tip] strange nr_cpus= boot regression

On Mon, Sep 26, 2016 at 02:39:53PM +0200, Mike Galbraith wrote:
> On Mon, 2016-09-26 at 14:29 +0200, Mike Galbraith wrote:
> 
> > Checkout timers/core, and merge nodeid, and all is well.  I'm currently
> > bisecting the result against HEAD.. which will likely be about as
> > useful as the last five bisections, but ya never know. (ok git, finger
> > somebody already [hotplug] and call it a day)
> 
> That came out backward, though it shouldn't matter.  I checked out
> nodeid, and merged timers/core into it, which works fine.

Ok, I can confirm the same observation without *any* command line
options diminishing the number of CPUs. I'm booting with halved CPU
numbers. Here's a coarse bisect of the merge commits of tip/master:

...
e47f2e50ead9 Merge tag 'configfs-for-4.8-2' of git://git.infradead.org/users/hch/configfs
d24efa23e93c Merge branch 'x86/apic'

<--- v4.8-rc7-714-gcdcef608a13d: bad

cdcef608a13d Merge branch 'linus'
450df5cb5cad Merge branch 'x86/vdso'
2f2c2f35ddbf Merge branch 'x86/timers'
782795482a9e Merge branch 'x86/platform'
1200484cdb51 Merge branch 'x86/cleanups'
b1591e618894 Merge branch 'x86/boot'
5b8b44cc2d19 Merge branch 'x86/asm'

<--- v4.8-rc7-496-g20eefd15d70: bad

20eefd15d70f Merge branch 'x86/apic'

<--- v4.8-rc7-475-gb468c89ee756: OK

b468c89ee756 Merge branch 'timers/core'

<--- v4.8-rc7-454-g4be273986460: OK

4be273986460 Merge branch 'smp/hotplug'

<--- v4.8-rc7-405-g1eaa05b665b0: OK

1eaa05b665b0 Merge branch 'sched/core'
b820db731394 Merge branch 'ras/core'
689d1113c7ba Merge branch 'perf/core'
f93add128c73 Merge branch 'mm/pkeys'
f0be67cb6c64 Merge branch 'locking/urgent'
ab5f266b0b55 Merge branch 'locking/core'
c69a1dec2a36 Merge branch 'irq/core'
87671cd5fb60 Merge branch 'efi/core'
51e5767069c8 Merge branch 'core/smp'
85202a2289d2 Merge branch 'core/rcu'
...

-- 
Regards/Gruss,
    Boris.

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