linux-kernel - Re: [BUG] [ tip/sched/core ] System unresponsive after booting

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Message-ID: <52D7FA85.9020504@linaro.org>
Date:	Thu, 16 Jan 2014 16:28:05 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	raistlin@...ux.it, juri.lelli@...il.com,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] [ tip/sched/core ] System unresponsive after booting

On 01/16/2014 03:25 PM, Peter Zijlstra wrote:
> On Thu, Jan 16, 2014 at 03:20:20PM +0100, Daniel Lezcano wrote:
>> Already tested. The last commits do not change the issue described above.
>
> Bummer, ok, what version of Ubuntu/rsyslogd are you using? I have a
> laptop around that should have some recent ubuntu on it, let me go find
> it.
>

Removing the lines below fix the issue.

These changes were introduced by the commit 
d50dde5a10f305253cbc3855307f608f8a3c5f73.

I don't get the connection between what is supposed to do the patch as 
described in the commit log and these four lines added.

diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 141baa3..acabef1 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -15,7 +15,7 @@

  #include <uapi/asm/unistd.h>
dlezcano@mai:~/Work/src/cpuidle-next (sched/idle-balance)$ git diff
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 93a2836..673edff 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3295,10 +3295,6 @@ recheck:
          * Allow unprivileged RT tasks to decrease priority:
          */
         if (user && !capable(CAP_SYS_NICE)) {
-               if (fair_policy(policy)) {
-                       if (!can_nice(p, attr->sched_nice))
-                               return -EPERM;
-               }

                 if (rt_policy(policy)) {
                         unsigned long rlim_rtprio =



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