netdev - Re: Poll about irqsafe_cpu

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Message-ID: <alpine.DEB.2.00.1103171016270.12540@router.home>
Date:	Thu, 17 Mar 2011 10:18:15 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Miller <davem@...emloft.net>
cc:	eric.dumazet@...il.com, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: Poll about irqsafe_cpu_add and others

On Thu, 17 Mar 2011, David Miller wrote:

>
> I had been meaning to bring this up from another perspective.
>
> In networking, we often only ever access objects in base or
> BH context.  Therefore in BH context cases we can do just
> normal counter bumps without any of the special atomic or
> IRQ disabling code at all.

We have the __ functions for that purpose. __this_cpu_inc f.e. falls back
to a simply ++ operation if the arch cannot provide something better.
irqsafe_xx are only used if the context does not provide any protection
and if there is the potential of the counter being incremented from an
interrupt context.

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