linux-kernel - Re: >= 2.6.30 broken alpha smp build

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Message-Id: <20090625115423.6a31b49c.akpm@linux-foundation.org>
Date:	Thu, 25 Jun 2009 11:54:23 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	maximilian attems <max@...o.at>
Cc:	linux-kernel@...r.kernel.org, tj@...nel.org, dhowells@...hat.com,
	ink@...assic.park.msu.ru
Subject: Re: >= 2.6.30 broken alpha smp build

On Thu, 25 Jun 2009 11:08:42 +0200
maximilian attems <max@...o.at> wrote:

> CC [M]  arch/alpha/kernel/srm_env.o
> In file included from /build/buildd-linux-2.6_2.6.30-1-alpha-vHGTgq/linux-2.6-2.6.30/debian/build/source_alpha_none/include/linux/percpu.h:10,
>                  from /build/buildd-linux-2.6_2.6.30-1-alpha-vHGTgq/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/include/asm/local.h:4,
>                  from /build/buildd-linux-2.6_2.6.30-1-alpha-vHGTgq/linux-2.6-2.6.30/debian/build/source_alpha_none/include/linux/module.h:20,
>                  from /build/buildd-linux-2.6_2.6.30-1-alpha-vHGTgq/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/kernel/srm_env.c:33:
> /build/buildd-linux-2.6_2.6.30-1-alpha-vHGTgq/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/include/asm/percpu.h:100:1: error: "PER_CPU_ATTRIBUTES" redefined
> /build/buildd-linux-2.6_2.6.30-1-alpha-vHGTgq/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/include/asm/percpu.h:52:1: error: this is the location of the previous definition
> make[6]: *** [arch/alpha/kernel/srm_env.o] Error 1
> make[5]: *** [arch/alpha/kernel] Error 2
> make[4]: *** [sub-make] Error 2
> make[3]: *** [all] Error 2
> make[2]: *** [debian/stamps/build_alpha_none_alpha-smp_plain] Error 2
> make[1]: *** [build_alpha_none_alpha-smp_real] Error 2

Me too.

> belows patch fixes aboves error but gives a new one on SMP
> 
> diff --git a/arch/alpha/include/asm/percpu.h b/arch/alpha/include/asm/percpu.h
> index 06c5c7a..622d585 100644
> --- a/arch/alpha/include/asm/percpu.h
> +++ b/arch/alpha/include/asm/percpu.h
> @@ -95,8 +95,8 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
>  #define PER_CPU_SHARED_ALIGNED_SECTION ""
>  #define PER_CPU_FIRST_SECTION ""
>  
> -#endif
> -
>  #define PER_CPU_ATTRIBUTES
>  
> +#endif
> +
>  #endif /* __ALPHA_PERCPU_H */
> 
>   CC [M]  arch/alpha/kernel/srm_env.o

That fixed it.

> cc1: warnings being treated as errors
> In file included from /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/include/linux/sched.h:86,
>                  from /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/include/asm/uaccess.h:5,
>                  from /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/kernel/srm_env.c:37:
> /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/include/linux/hrtimer.h:310: error: ___~@..._used_____~@~Y attribute ignored
> In file included from /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/include/asm/uaccess.h:5,
>                  from /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/arch/alpha/kernel/srm_env.c:37:
> /home/maks/src/linux-2.6-2.6.30/debian/build/source_alpha_none/include/linux/sched.h:134: error: ___~@..._used_____~@~Y attribute ignored
> make[6]: *** [arch/alpha/kernel/srm_env.o] Error 1
> 

This is the

#define PER_CPU_ATTRIBUTES	__used

in arch/alpha/include/asm/percpu.h, added by 

commit 9267b4b3880d00dc2dab90f1d817c856939114f7
Author:     Ivan Kokshaysky <ink@...assic.park.msu.ru>
AuthorDate: Sat Jun 21 03:25:39 2008 +0400
Commit:     Linus Torvalds <torvalds@...ux-foundation.org>
CommitDate: Fri Jun 20 16:46:10 2008 -0700

    alpha: fix module load failures on smp (bug #10926)


There's no indication in the changelog why this was added and afacit no
other architectures do it.  So I'm at a loss to help here. 
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