linux-kernel - Re: [patch 02/41] cpu alloc: The allocator

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Message-ID: <Pine.LNX.4.64.0806101032550.17131@schroedinger.engr.sgi.com>
Date:	Tue, 10 Jun 2008 10:33:29 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mike Travis <travis@....com>
cc:	Eric Dumazet <dada1@...mosbay.com>, akpm@...ux-foundation.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 02/41] cpu alloc: The allocator

On Wed, 4 Jun 2008, Mike Travis wrote:

> I'm a bit confused.  Why is DEFINE_PER_CPU_SHARED_ALIGNED() conditioned on
> ifdef MODULE?
> 
>         #ifdef MODULE
>         #define SHARED_ALIGNED_SECTION ".data.percpu"
>         #else
>         #define SHARED_ALIGNED_SECTION ".data.percpu.shared_aligned"
>         #endif
> 
>         #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                       \
>                 __attribute__((__section__(SHARED_ALIGNED_SECTION)))            \
>                 PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name             \
>                 ____cacheline_aligned_in_smp

Looks wrong to me. There can be shared objects even without modules.

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