linux-kernel - Re: NOHZ: local_softirq

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Message-Id: <20091011.033842.58792773.davem@davemloft.net>
Date:	Sun, 11 Oct 2009 03:38:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mb@...sch.de
Cc:	johannes@...solutions.net, hidave.darkstar@...il.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-wireless@...r.kernel.org
Subject: Re: NOHZ: local_softirq_pending 08

From: Michael Buesch <mb@...sch.de>
Date: Sun, 11 Oct 2009 12:17:30 +0200

> On Sunday 11 October 2009 12:08:55 Johannes Berg wrote:
>> On Sun, 2009-10-11 at 17:52 +0800, Dave Young wrote:
>> 
>> FWIW, I believe the bug to be in b43 and wl12x1, and not as Michael
>> thinks in the stack.
> 
> If mac80211 requires BHs disabled, it should do this.

That's overhead, and %99 of drivers do not require it, and therefore
for %99 of drivers it's unnecessary overhead.

In general we avoid doing things like that.  Instead, we put the
cost only where it's actually needed.
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