linux-kernel - Re: Possible regression due to "tick: broadcast: Prevent livelock from event handler"

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Date:	Fri, 03 Jul 2015 15:45:41 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	Sudeep Holla <sudeep.holla@....com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Kevin Hilman <khilman@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Tyler Baker <tyler.baker@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Simon Horman <horms@...ge.net.au>,
	Borislav Petkov <bp@...en8.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Possible regression due to "tick: broadcast: Prevent livelock
 from event handler"



On 03/07/15 15:37, Wolfram Sang wrote:
>
>> So this is a single core machine and uses the em_sti timer w/o the
>> broadcast nonsense. In Simons case it looks like em_sti is used as
>> broadcast device.
>
> We use the same board. Just my kernel has SMP=n.
>

If it's UP build, then GENERIC_CLOCKEVENTS_BROADCAST is disabled. You
may be hitting the issue I reported[1] and is still under discussion.

Regards,
Sudeep

[1] https://lkml.org/lkml/2015/6/25/271
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