linux-kernel - [PATCH] per_cpu: fix DEFINE_PER_CPU_SHARED

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Message-ID: <4829AFCB.9090801@cosmosbay.com>
Date:	Tue, 13 May 2008 17:12:11 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, Fenghua Yu <fenghua.yu@...el.com>,
	Mike Travis <travis@....com>
Subject: [PATCH] per_cpu: fix DEFINE_PER_CPU_SHARED_ALIGNED for modules

Andrew,

This patch is a follow up to thread initiated by Gianni Tedesco
in http://marc.info/?l=linux-kernel&m=121059431214889&w=2
(oprofile BUG() in current kernel.)

Thank you

[PATCH] per_cpu: fix DEFINE_PER_CPU_SHARED_ALIGNED for modules

Current module loader lookups ".data.percpu" ELF section to perform
per_cpu relocation. But DEFINE_PER_CPU_SHARED_ALIGNED()
uses another section (".data.percpu.shared_aligned"), currently only
handled in vmlinux.lds, not by module loader.

To correct this problem, instead of adding logic into module loader,
or using at build time a module.lds file for all arches to group
".data.percpu.shared_aligned"  into ".data.percpu",
just use ".data.percpu" for modules.

Alignment requirements are correctly handled by ld and module loader.

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 include/linux/percpu.h |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletion(-)

View attachment "percpu_shared_aligned.patch" of type "text/plain" (697 bytes)