linux-kernel - Re: [RFC] percpu: convert SNMP mibs to new infra

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Message-ID: <20090402040537.GB30442@elte.hu>
Date:	Thu, 2 Apr 2009 06:05:37 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <htejun@...il.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Joe Perches <joe@...ches.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC] percpu: convert SNMP mibs to new infra


* Tejun Heo <htejun@...il.com> wrote:

> Hello, Eric, Ingo.
> 
> Eric Dumazet wrote:
> > diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
> > index aee103b..6b82f6b 100644
> > --- a/arch/x86/include/asm/percpu.h
> > +++ b/arch/x86/include/asm/percpu.h
> > @@ -135,6 +135,9 @@ do {							\
> >  #define percpu_read(var)	percpu_from_op("mov", per_cpu__##var)
> >  #define percpu_write(var, val)	percpu_to_op("mov", per_cpu__##var, val)
> >  #define percpu_add(var, val)	percpu_to_op("add", per_cpu__##var, val)
> > +#define indir_percpu_add(var, val)	percpu_to_op("add", *(var), val)
> > +#define indir_percpu_inc(var)       percpu_to_op("add", *(var), 1)
> > +#define indir_percpu_dec(var)       percpu_to_op("add", *(var), -1)
> >  #define percpu_sub(var, val)	percpu_to_op("sub", per_cpu__##var, val)
> >  #define percpu_and(var, val)	percpu_to_op("and", per_cpu__##var, val)
> >  #define percpu_or(var, val)	percpu_to_op("or", per_cpu__##var, val)
> 
> The final goal is to unify static and dynamic accesses but we 
> aren't there yet, so, for the time being, we'll need some interim 
> solutions. I would prefer percpu_ptr_add() tho.

Yep, that's the standard naming scheme for new APIs: generic to 
specific, left to right.

	Ingo
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