linux-kernel - Re: [GIT Pull] timer fixes for 3.14

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Message-ID: <530423CB.5060105@linux.vnet.ibm.com>
Date:	Wed, 19 Feb 2014 08:53:55 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Preeti Murthy <preeti.lkml@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [GIT Pull] timer fixes for 3.14

On 02/19/2014 12:10 AM, Thomas Gleixner wrote:
> On Tue, 18 Feb 2014, Preeti Murthy wrote:
> 
>> Hi Thomas,
>>
>> With regard to the patch: "tick: Clear broadcast pending bit when
>> switching to oneshot"
>> isn't BROADCAST_EXIT called atleast after initializing the high
>> resolution timers while
>> handling the broadcast IPI and before re-entering idle? This should
>> clear the cpu bit
>> in the pending mask right?
>>
>> idle()
>> |__BROADCAST_ENTER
>>     |__halt()
>>       |__broadcast_ipi
>>           |__init_highres()->clear oneshot mask
>>               |__return from interrupt->BROADCAST_EXIT (clear pending mask)
> 
> Unfortunately not:
> 
>      if (cpumask_test_and_clear_cpu(cpu, tick_broadcast_oneshot_mask)) {
>      	  clear pending mask;
>      }
> 
>>                    |__re-enter idle
> 
> Go figure :)

Ah right! Thanks :)

Regards
Preeti U Murthy
> 
> Thanks,
> 
> 	tglx
> 

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