netdev - Re: [Uclinux-dist-devel] [PATCH 1/5] netdev: bfin_mac: Blackfin EMAC interrupt may not be shared

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Message-ID: <8bd0f97a0905290445x3b0829f3h657fec534f290c7f@mail.gmail.com>
Date:	Fri, 29 May 2009 07:45:05 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Michael.Hennerich@...log.com, netdev@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [Uclinux-dist-devel] [PATCH 1/5] netdev: bfin_mac: Blackfin EMAC 
	interrupt may not be shared

On Fri, May 29, 2009 at 07:28, David Miller wrote:
> From: Mike Frysinger <vapier.adi@...il.com>
>> why implement extra over head in an interrupt handler to support an
>> operating mode the hardware can never support.
>
> What overhead?  It should be pretty easy to see if the device
> is really indicating an interrupt or not :-)

which would involve reading system mmrs which are clocked at the
system frequency and thus make the core stall
-mike
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