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

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Date:	Thu, 14 May 2015 07:41:54 -0700
From:	"Doug Smythies" <dsmythies@...us.net>
To:	<juri.lelli@....com>, <peterz@...radead.org>,
	"'Ingo Molnar'" <mingo@...nel.org>
Cc:	<linux-kernel@...r.kernel.org>,
	"Doug Smythies" <dsmythies@...us.net>
Subject: On resume from suspend only CPU 0 comes back on-line [REGRESSION][BISECTED]

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:

3c18d447b3b36a8d3c90dc37dfbd363cdb685d0a is the first bad commit
commit 3c18d447b3b36a8d3c90dc37dfbd363cdb685d0a
Author: Juri Lelli <juri.lelli@....com>
Date:   Tue Mar 31 09:53:37 2015 +0100

    sched/core: Check for available DL bandwidth in cpuset_cpu_inactive()

    Hotplug operations are destructive w.r.t. cpusets. In case such an
    operation is performed on a CPU belonging to an exlusive cpuset, the
    DL bandwidth information associated with the corresponding root
    domain is gone even if the operation fails (in sched_cpu_inactive()).

    For this reason we need to move the check we currently have in
    sched_cpu_inactive() to cpuset_cpu_inactive() to prevent useless
    cpusets reconfiguration in the CPU_DOWN_FAILED path.

    Signed-off-by: Juri Lelli <juri.lelli@....com>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Cc: Juri Lelli <juri.lelli@...il.com>
    Link: http://lkml.kernel.org/r/1427792017-7356-2-git-send-email-juri.lelli@arm.com
    Signed-off-by: Ingo Molnar <mingo@...nel.org>

:040000 040000 10f8d81afdc8e625f8e6720883d3eb42c28d452b c08264528890941bad35d5d4cc134c03f259c534 M      kernel

Since I sometimes mess up using git bisect, and end up at some random result,
the above was double checked manually:

3c18d447b3b36a8d3c90dc37dfbd363cdb685d0a has the issue.
4cd57f97135840f637431c92380c8da3edbe44ed (the previous commit) does not have the issue.


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