linux-kernel - Re: oprofile BUG() in current kernel.

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Message-Id: <20080513082313.cbbe81af.akpm@linux-foundation.org>
Date:	Tue, 13 May 2008 08:23:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Gianni Tedesco <gxt@...nott.ac.uk>, arges@...ux.vnet.ibm.com,
	Maynard Johnson <maynardj@...ibm.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org, oprofile-list@...ts.sourceforge.net,
	Mike Travis <travis@....com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: oprofile BUG() in current kernel.

On Tue, 13 May 2008 12:25:26 +0200 Eric Dumazet <dada1@...mosbay.com> wrote:

> Current module loader only allocates percpu room by examining 
> ".data.percpu" section and should be augmented to also look at 
> ".data.percpu.shared_aligned"
> Or, change DEFINE_PER_CPU_SHARED_ALIGNED() for modules (to use 
> ".data.percpu" only)

Well that's a little landmine.  Seems that this was the first attempt to
use DEFINE_PER_CPU_SHARED_ALIGNED from within a module.

> Anyway, with the per_cpu conversion of cpu_buffer, we dont need to 
> request cache_line alignment anymore
>
> [PATCH] oprofile: Dont request cache line alignment for cpu_buffer

Thanks.  Silly me for looking at the nearly-one-year-old
DEFINE_PER_CPU_SHARED_ALIGNED and assuming that it worked :(


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