netdev - Re: [RFC PATCH 09/13] clocksource: allow usage independent of timekeeping.c

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Message-Id: <20081112.020434.50448090.davem@davemloft.net>
Date:	Wed, 12 Nov 2008 02:04:34 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	patrick.ohly@...el.com
Cc:	netdev@...r.kernel.org, opurdila@...acom.com,
	shemminger@...tta.com, netdev@...eo.de, ak@...ux.intel.com,
	john.ronciak@...el.com, dada1@...mosbay.com, oliver@...tkopp.net
Subject: Re: [RFC PATCH 09/13] clocksource: allow usage independent of
 timekeeping.c

From: Patrick Ohly <patrick.ohly@...el.com>
Date: Tue, 4 Nov 2008 10:23:42 +0100

> So far struct clocksource acted as the interface between time/timekeeping
> and hardware. This patch generalizes the concept so that the same
> interface can also be used in other contexts.
> 
> The only change as far as kernel/time/timekeeping is concerned is that
> the hardware access can be done either with or without passing
> the clocksource pointer as context. This is necessary in those
> cases when there is more than one instance of the hardware.
> 
> The extensions in this patch add code which turns the raw cycle count
> provided by hardware into a continously increasing time value. This
> reuses fields also used by timekeeping.c. Because of slightly different
> semantic (__get_nsec_offset does not update cycle_last, clocksource_read_ns
> does that transparently) timekeeping.c was not modified to use the
> generalized code.
> 
> The new code does no locking of the clocksource. This is the responsibility
> of the caller.
> 
> Signed-off-by: Patrick Ohly <patrick.ohly@...el.com>

This patch, since it changes generic facilities in the kernel rather
than networking specific ones, will need to get a full review on
linux-kernel
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