linux-kernel - Re: [PATCH] ktime: Fix ktime

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Message-ID: <alpine.LFD.2.11.1505012008080.7750@knanqh.ubzr>
Date:	Fri, 1 May 2015 20:14:23 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	John Stultz <john.stultz@...aro.org>
cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Josh Boyer <jwboyer@...hat.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] ktime: Fix ktime_divns to do signed division

On Fri, 1 May 2015, John Stultz wrote:

>  static inline u64 ktime_divns(const ktime_t kt, s64 div)
>  {
>  	if (__builtin_constant_p(div) && !(div >> 32)) {
> -		u64 ns = kt.tv64;
> +		s64 ns = kt.tv64;
> +		int neg = 0;
> +
> +		if (ns < 0) {
> +			neg = 1;
> +			ns = -ns;
> +		}

Minor comment: you could save some realestate with:

		s64 ns = kt.tv64;
		bool neg = (ns < 0);

		if (neg)
			ns = -ns;


Nicolas
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