linux-kernel - Re: [PATCH 2/4] time: add a notifier chain for when the system time is stepped

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Message-ID: <51C886CF.4010001@linaro.org>
Date:	Mon, 24 Jun 2013 10:50:07 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, xen-devel@...ts.xen.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/4] time: add a notifier chain for when the system time
 is stepped

On 06/24/2013 10:00 AM, David Vrabel wrote:
> On 24/06/13 17:30, Thomas Gleixner wrote:
>> @@ -508,7 +509,7 @@ int do_settimeofday(const struct timespec *tv)
>>   
>>   	tk_set_xtime(tk, tv);
>>   
>> -	timekeeping_update(tk, true, true);
>> +	timekeeping_update(tk, true, true, true);
> These three booleans in a row is getting a bit opaque. How about I also
> change it to a set of flags?  e.g.,
>
> timekeeping_updated(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);

Yea. I'm not a fan of the bool arguments to functions (which I have to 
look up every time as which bool is which).

The bitflag approach is nicer in my mind, since its a bit more explicit 
when reading the code.

The other approach would be to have different function calls 
(timekeeping_clear_ntp, timekeeping_mirror, timekeeping_clock_was_set), 
which call into the same back end logic.

thanks
-john
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