linux-kernel - Re: LinuxPPS & spinlocks

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Date:	Fri, 27 Jul 2007 13:40:14 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Rodolfo Giometti <giometti@...eenne.com>
CC:	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: LinuxPPS & spinlocks

Rodolfo Giometti wrote:

> What do you mean? Did you find an error into my patch? :-o
> 
> Functions pps_event() and
> pps_register_source()/pps_unregister_source() take accesso to shared
> data, that's why I used spinlocks.

My point is that the lock should be used to protect specific data. 
Thus, it would be more correct to say, "spinlock foo is taken because 
pps_register_source() accesses variable bar".

That way, if someone else wants to access "bar", they know that they 
need to take lock "foo".

Chris
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