linux-kernel - Re: LinuxPPS & spinlocks

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Message-ID: <alpine.LFD.0.999.0707301452380.13448@enigma.security.iitk.ac.in>
Date:	Mon, 30 Jul 2007 15:01:28 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Rodolfo Giometti <giometti@...eenne.com>
cc:	Chris Friesen <cfriesen@...tel.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: LinuxPPS & spinlocks

Hi Rodolfo,


On Mon, 30 Jul 2007, Rodolfo Giometti wrote:

> On Mon, Jul 30, 2007 at 10:39:38AM +0530, Satyam Sharma wrote:
> > 
> > Nopes, this isn't quite correct/safe. I suggest you should read:
> > 
> > http://www.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/
> 
> I read it but still I don't see why my solution isn't correct/safe. :)

What does the section on locking between hard irq contexts (or between
user process context and hard irq context) say?

> Can you please propose to me your solution?

As I said, you could just use the spin_lock_irqsave/restore() variants ...
If you want, I can try and implement the other bits that I had suggested
for the other things as well :-)


Ciao,
Satyam
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