linux-kernel - RE: [patch V2] wireless: mwifiex: Use the proper interfaces

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Date:	Fri, 13 Jun 2014 11:28:54 -0700
From:	Bing Zhao <bzhao@...vell.com>
To:	Johannes Berg <johannes@...solutions.net>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"John W. Linville" <linville@...driver.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: RE: [patch V2] wireless: mwifiex: Use the proper interfaces


> > +	u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
> 
> FWIW, I think the same as patch 12 applies here. net_timedelta() doesn't
> really seem to be a good way to calculate time deltas.

Shall we change net_timedelta to ktime_sub() using ktime_get()?

+	u32 queue_delay = ktime_to_ms(ktime_sub(ktime_get(), skb->tstamp));

Thanks,
Bing

> 
> And yes - I've seen situations where this matters, e.g. when running
> ntpdate after system startup.
> 
> johannes
>