linux-kernel - Re: [PATCH] time: Provide full featured jiffies_to

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Date:	Sat, 28 Jun 2014 19:56:09 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	"Luck, Tony" <tony.luck@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Frederic Weisbecker" <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Mauro Chehab <m.chehab@...sung.com>
Subject: Re: [PATCH] time: Provide full featured jiffies_to_nsecs() function

On 2014/5/20 6:35, Luck, Tony wrote:
>> Another problem, maybe we should use get_jiffies_64() instead of jiffies
>> directly here OR we'll meet wraparound problems on 32bit system. But a
>> same problem is that the jiffies_lock is not safe in NMI context...
> 
> To quote Winnie the Pooh - "Bother".
> 
> Can someone think of a clever way to get a sane 64 bit jiffie value on
> 32-bit systems (even when we get an NMI in the middle of updating the
> 64-bit jiffie)?

Hi Tony & Steven,

I've sent a patch to solve this problem, please help to review, thanks.

	http://lkml.org/lkml/2014/6/28/41
	tracing: fix uptime overflow problem

Thanks,
	XiuQi

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