linux-kernel - Re: + alpha-fix-percpu-build-breakage.patch added to -mm tree

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Message-ID: <20090629223646.GI3564@stro.at>
Date:	Tue, 30 Jun 2009 00:36:46 +0200
From:	maximilian attems <max@...o.at>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, tj@...nel.org,
	ink@...assic.park.msu.ru, rth@...ddle.net, stable@...nel.org
Subject: Re: + alpha-fix-percpu-build-breakage.patch added to -mm tree

On Sat, 27 Jun 2009, akpm@...ux-foundation.org wrote:

> 
> The patch titled
>      alpha: fix percpu build breakage
> has been added to the -mm tree.  Its filename is
>      alpha-fix-percpu-build-breakage.patch
> 
> Before you just go and hit "reply", please:
>    a) Consider who else should be cc'ed
>    b) Prefer to cc a suitable mailing list as well
>    c) Ideally: find the original patch on the mailing list and do a
>       reply-to-all to that, adding suitable additional cc's
> 
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
> 
> See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
> out what to do about this
> 
> The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
> 
> ------------------------------------------------------
> Subject: alpha: fix percpu build breakage
> From: Tejun Heo <tj@...nel.org>
> 
> alpha percpu access requires custom SHIFT_PERCPU_PTR() definition for
> modules to work around addressing range limitation.  This is done via
> generating inline assembly using C preprocessing which forces the
> assembler to generate external reference.  This happens behind the
> compiler's back and makes the compiler think that static percpu variables
> in modules are unused.
> 
> This used to be worked around by using __unused attribute for percpu
> variables which prevent the compiler from omitting the variable; however,
> recent declare/definition attribute unification change broke this as
> __used can't be used for declaration.  Also, in the process,
> PER_CPU_ATTRIBUTES definition in alpha percpu.h got broken.
> 
> This patch adds PER_CPU_DEF_ATTRIBUTES which is only used for definitions
> and make alpha use it to add __used for percpu variables in modules.  This
> also fixes the PER_CPU_ATTRIBUTES double definition bug.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: maximilian attems <max@...o.at>
> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> Cc: Richard Henderson <rth@...ddle.net>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  arch/alpha/include/asm/percpu.h |    6 +++---
>  include/asm-generic/percpu.h    |    4 ++++
>  include/linux/percpu-defs.h     |    3 ++-
>  3 files changed, 9 insertions(+), 4 deletions(-)

verified that all Debian alpha images build fine with aboves patch.
thanks.
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