linux-kernel - Re: On resume from suspend only CPU 0 comes back on-line [REGRESSION][BISECTED]

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Date:	Fri, 15 May 2015 08:51:47 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Doug Smythies <dsmythies@...us.net>
Cc:	'Juri Lelli' <juri.lelli@....com>, peterz@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: On resume from suspend only CPU 0 comes back on-line
 [REGRESSION][BISECTED]


* Doug Smythies <dsmythies@...us.net> wrote:

> On 2015.05.14 10:48 Ingo Molnar wrote:
> 
> > * Juri Lelli <juri.lelli@....com> wrote:
> >>> On 14/05/15 15:41, Doug Smythies wrote:
> >>> As of, or about, Kernel 4.1RC1 on resume from suspend only CPU 0 comes back on-line.
> >>> The issue persists through Kernel 4.1RC3.
> >>> This is on my test computer with an i7-2600K.
> >>> I do not normally use suspend on this computer, but was doing so while working on a bug report.
> >>> 
> >>> The kernel was bisected, and this is the result:
> >>> 
> >> 
> >> Does commit 533445c6e533 "sched/core: Fix regression in
> >> cpuset_cpu_inactive() for suspend" on tip/sched/core
> >> fix the bug?
> 
> > That would be sched/urgent primarily, not sched/core:
> > git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/urgent
> > I'll get this fix to Linus ASAP.
> 
> I could not seem to figure out how to get the patch from tip,
> and any version I could find on internet would not apply properly.

So the way you could have picked it up is something like:

  # pick up 533445c6e533
  git fetch git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/urgent
  git cherry-pick 533445c6e533

or pick up all pending scheduler fixes, amongst them 533445c6e533:

  git pull git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/urgent

Or to export just that single one as a patch:

  git fetch git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/urgent
  git log --pretty=email --stat -p -1 533445c6e533

> Juri kindly sent me the patch.
> 
> With the patch applied to an otherwise unmodified Kernel 4.1RC3, 
> Resume from suspend is working fine again.

Great, thanks for testing!

	Ingo
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