netdev - Re: mac80211: NOHZ: local_softirq

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Date:	Wed, 30 Sep 2009 17:47:32 +0300
From:	Kalle Valo <kalle.valo@....fi>
To:	Michael Buesch <mb@...sch.de>
Cc:	Oliver Hartkopp <socketcan@...tkopp.net>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: mac80211: NOHZ: local_softirq_pending 08

Michael Buesch <mb@...sch.de> writes:

>> I don't know how expensive in_interrupt() is, but it IMO should be
>> avoided when the context for a code section can be determined in
>> another way.
>
> What if we just get the fix merged and discuss later whether it's
> worth to optimize a picosecond or not?? My patch fixes the _bug_.
> You can merge a more "efficient" fix later that saves one or two CPU
> cycles.

I agree with Michael. The bug is real and I have verified that
Michael's patch fixes the issue. Better to apply the patch now, it's
trivial to change the implementation if/when the network stack has
support for this.

-- 
Kalle Valo
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