linux-kernel - Re: [PATCH v2 net-next] net: convert lls to use time_in

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Message-ID: <1372795835.1919.14.camel@bwh-desktop.uk.level5networks.com>
Date:	Tue, 2 Jul 2013 21:10:35 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
CC:	David Miller <davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, <willemb@...gle.com>,
	<erdnetdev@...il.com>, <andi@...stfloor.org>, <hpa@...or.com>,
	<devel-lists@...yps.com>, <eliezer@...ir.org.il>
Subject: Re: [PATCH v2 net-next] net: convert lls to use time_in_range()

On Tue, 2013-07-02 at 12:49 +0300, Eliezer Tamir wrote:
> Time in range will fail safely if we move to a different cpu with an
> extremely large clock skew.
> Add time_in_range64() and convert lls to use it.
> 
> Signed-off-by: Eliezer Tamir <eliezer.tamir@...ux.intel.com>
> ---
> v1->v2
> fixed double call to sched_clock() in can_poll_ll(), checkpatchisms
[...]
> --- a/include/linux/jiffies.h
> +++ b/include/linux/jiffies.h
> @@ -139,6 +139,10 @@ static inline u64 get_jiffies_64(void)
>   	 ((__s64)(a) - (__s64)(b) >= 0))
>   #define time_before_eq64(a,b)	time_after_eq64(b,a)
> 
> +#define time_in_range64(a, b, c) \
> +	(time_after_eq64(a, b) && \
> +	 time_before_eq64(a, c))
[...]

Why not make this an inline function, so the caller doesn't need to
worry about repeated evaluation?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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