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

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F3280EB34@ORSMSX114.amr.corp.intel.com>
Date:	Mon, 19 May 2014 22:35:31 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Xie XiuQi <xiexiuqi@...wei.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Steven Rostedt" <rostedt@...dmis.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

> 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)?

-Tony
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