linux-kernel - Re: [PATCH 3.19 016/175] ksoftirqd: Enable IRQs and call cond

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Message-ID: <55505FE9.8070505@suse.cz>
Date:	Mon, 11 May 2015 09:53:13 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Michal Kubecek <mkubecek@...e.cz>,
	Mike Galbraith <umgwanakikbuti@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Josh Hunt <joshhunt00@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>,
	Calvin Owens <calvinowens@...com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 3.19 016/175] ksoftirqd: Enable IRQs and call cond_resched()
 before poking RCU

On 05/11/2015, 09:37 AM, Michal Kubecek wrote:
> On Sat, May 02, 2015 at 05:14:50AM +0200, Mike Galbraith wrote:
>> On Fri, 2015-05-01 at 22:52 +0200, Greg Kroah-Hartman wrote:
>>> On Fri, May 01, 2015 at 03:00:00PM -0500, Josh Hunt wrote:
>>>> On Wed, Mar 4, 2015 at 12:13 AM, Greg Kroah-Hartman
>>>> <gregkh@...uxfoundation.org> wrote:
>>>>> 3.19-stable review patch.  If anyone has any objections, please let me know.
>>>>>
>>>>> ------------------
>>>>>
>>>>> From: Calvin Owens <calvinowens@...com>
>>>>>
>>>>> commit 28423ad283d5348793b0c45cc9b1af058e776fd6 upstream.
>>>>>
>>>>> While debugging an issue with excessive softirq usage, I encountered the
>>>>> following note in commit 3e339b5dae24a706 ("softirq: Use hotplug thread
>>>>> infrastructure"):
>>>>>
>>>>>     [ paulmck: Call rcu_note_context_switch() with interrupts enabled. ]

...

>>>> Sorry for the delay in noticing this, but should this be applied to
>>>> 3.14-stable as well?
>>>
>>> Why should it?
>>
>> The regression inducing change arrived in 3.7-rc1.
> 
> I guess stable-3.12.y should have it too, then (with a trivial refresh
> for the comment added in 3.13).

Yes, I already put it into 3.12. Thanks.

-- 
js
suse labs
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