linux-kernel - Re: [PATCH v3] watchdog/imx2+: add support for pretimeout interrupt functionality

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Message-ID: <20120927212444.GK16482@spo001.leaseweb.com>
Date:	Thu, 27 Sep 2012 23:24:44 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Oskar Schirmer <oskar@...ra.com>
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	Wolfram Sang <w.sang@...gutronix.de>,
	Sascha Hauer <kernel@...gutronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3] watchdog/imx2+: add support for pretimeout interrupt functionality

Hi Oskar,

> unless there is another issue with this patch,
> could You give an ack now?
> 
> thanks,
>   Oskar
> 
> On Thu, Sep 20, 2012 at 15:37:24 +0000, Oskar Schirmer wrote:
> > This watchdog device provides pretimeout facilities:
> > Set some timeout value and get informed about imminent
> > watchdog activity thru interrupt.
> > 
> > Allow user to wait for this asynchronous event thru poll(2),
> > and to clear it implicitely upon dog appeasement.
> > 
> > There is only one precedent in current kernel that implements
> > watchdog pretimeout, ipmi_watchdog. It provides pretimeout
> > event thru poll, and requires a read(2) call to clear it.
> > 
> > However, as write(2) does calm the dog and so wind up the
> > timer anyway, it is obvious to let poll(2) state writability
> > where pretimeout has passed.
> [...]

No, I'm not givinbg this an ACK nor a NAK at this moment.
I will review best options after the next merge window.

Kind regards,
Wim.

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