linux-kernel - Re: [PATCH V7 1/8] ntp: add ADJ

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Date:	Tue, 21 Dec 2010 14:25:55 -0800
From:	john stultz <johnstul@...ibm.com>
To:	"Kuwahara,T." <6vvetjsrt26xsrzlh1z0zn4d2grdah@...il.com>
Cc:	Richard Cochran <richardcochran@...il.com>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Lameter <cl@...ux.com>,
	David Miller <davem@...emloft.net>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH V7 1/8] ntp: add ADJ_SETOFFSET mode bit

On Wed, 2010-12-22 at 05:57 +0900, Kuwahara,T. wrote:

> How about this?
> 
> if (txc->modes & ADJ_OFFSET) {
> 	if (txc->constant == INT32_MIN) {
> 		/* step time */
> 	} else {
> 		/* slew time */
> 	}
> }

This looks like magic behavior. Sort of a "knock twice and then say the
password" interface. I don't see why that would be better then adding a
clear new mode flag?


> That said, I'm somehow against the idea of using the adjtimex syscall
> for that purpose.

Could you expand on why you don't like this?

thanks
-john


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