linux-kernel - Re: [RT PATCH 2/2] timers: wakeup all timer waiters without holding the base lock

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Message-ID: <f0be3636-1189-9bf9-37f0-40ad1d32baf7@linutronix.de>
Date:	Thu, 14 Jul 2016 19:19:47 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [RT PATCH 2/2] timers: wakeup all timer waiters without holding
 the base lock

On 07/14/2016 06:09 PM, Steven Rostedt wrote:
> On Thu, 14 Jul 2016 18:05:04 +0200
> Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
>> There should be no need to hold the base lock during the wakeup. There
>> should be no boosting involved, the wakeup list has its own lock so it
>> should be safe to do this without the lock.
>>
>> Cc: stable-rt@...r.kernel.org
> 
> Nothing against this patch, but as you marked it for stable, can you
> add to the change log what issue you had that caused you to make this
> change?

#1 was noticed while looking at the code, it *might* happen.
#2 Is not strictly required for back porting.
I just don't see a reason for holding the lock, that is all.

> -- Steve

Sebastian