netdev - Re: [net-next-2.6 PATCH 8/9] vxge: Acquire correct lock based on interrupt context.

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Message-ID: <4ACAB72A.3080802@gmail.com>
Date:	Tue, 06 Oct 2009 05:19:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ramkrishna Vepa <Ramkrishna.Vepa@...erion.com>
CC:	David Miller <davem@...emloft.net>,
	Sreenivasa Honnur <Sreenivasa.Honnur@...erion.com>,
	netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH 8/9] vxge: Acquire correct lock based on
 interrupt context.

Ramkrishna Vepa a écrit :
> [Ram] Right, but why have the additional step of saving and restoring
> the flags while in the interrupt context?
> 

It costs about the same thing than testing two times in_interrupt()

pushf
pop register
test iflag,register
je ...


In the end, original code is shorter and faster.
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