linux-kernel - Re: [patch 04/41] cpu ops: Core piece for generic atomic per cpu operations

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Date:	Fri, 30 May 2008 16:32:07 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Travis <travis@....com>
Subject: Re: [patch 04/41] cpu ops: Core piece for generic atomic per cpu operations

On Friday 30 May 2008 15:17:55 Christoph Lameter wrote:
> On Thu, 29 May 2008, Andrew Morton wrote:
> > > 	local_irq_save(flags);
> > > 	/* Calculate address of per processor area */
> > > 	p = CPU_PTR(stat, smp_processor_id());
> > > 	p->counter++;
> > > 	local_irq_restore(flags);
> >
> > eh?  That's what local_t is for?
>
> No that is what local_t exactly cannot do.

Yes, but this is local_t for dynamically allocated per-cpu vars.  You've lost 
potential symmetry and invented a whole new nomenclature :(

local_ptr_inc() etc would be far preferable IMHO.

Cheers,
Rusty.
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