Date: Wed, 14 Jan 2009 10:45:46 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>, Brian Gerst <brgerst@gmail.com>,
       ebiederm@xmission.com, cl@linux-foundation.org, rusty@rustcorp.com.au,
       travis@sgi.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
       steiner@sgi.com, hugh@veritas.com
Subject: Re: [patch] add optimized generic percpu accessors
Message-ID: <20090114094546.GA29776@elte.hu>
References: <1231843097-18003-1-git-send-email-tj@kernel.org> <496C717F.70204@kernel.org> <73c1f2160901130527s2d61f4ewf0725c3bf1b36a1a@mail.gmail.com> <496C9FB7.9050907@kernel.org> <496D8CEB.5060402@zytor.com> <20090114093834.GA19799@elte.hu>
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* Ingo Molnar <mingo@elte.hu> wrote:

> Tejun, could you please also add the patch below to your lineup too?
> 
> It is an optimization and a cleanup, and adds the following new generic 
> percpu methods:
> 
>   percpu_read()
>   percpu_write()
>   percpu_add()
>   percpu_sub()
>   percpu_or() 
>   percpu_xor()
> 
> and implements support for them on x86. (other architectures will fall 
> back to a default implementation)

btw., this patch means that we can move Brian's original PDA cleanups 
fully and without kernel size bloat: instead of pda_read() we can use 
percpu_read(), and not bloat the kernel at all.

and thus the pda ops can go away completely.

	Ingo
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