linux-kernel - Re: frv cmpxchg

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Message-ID: <20080208013422.GA22122@Krystal>
Date:	Thu, 7 Feb 2008 20:34:23 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: Re: frv cmpxchg_local compile error

* Adrian Bunk (bunk@...nel.org) wrote:
> Commit 14e0cb3c60b89c4a2512852ffc18601c72314a0f broke frv compilation:
> 
> <--  snip  -->
> 
> ...
>   CC      arch/frv/kernel/asm-offsets.s
> In file included from include/asm/system.h:271,
>                  from include/asm/bitops.h:19,
>                  from include/linux/bitops.h:17,
>                  from include/linux/kernel.h:15,
>                  from include/linux/sched.h:52,
>                  from arch/frv/kernel/asm-offsets.c:7:
> include/asm-generic/cmpxchg-local.h: In function '__cmpxchg_local_generic':
> include/asm-generic/cmpxchg-local.h:23: error: implicit declaration of function 'typecheck'


Isn't typecheck() supposed to be defined in kernel.h which is included
_everywhere_ ?

Hrm, I see, dependency from kernel.h on bitops.h on asm/bitops.h on
asm/system.h.



> include/asm-generic/cmpxchg-local.h:23: error: expected expression before 'unsigned'
> include/asm-generic/cmpxchg-local.h:23: error: expected expression before 'unsigned'
> include/asm-generic/cmpxchg-local.h:44: error: expected expression before 'unsigned'
> include/asm-generic/cmpxchg-local.h: In function '__cmpxchg64_local_generic':
> include/asm-generic/cmpxchg-local.h:57: error: expected expression before 'unsigned'
> include/asm-generic/cmpxchg-local.h:57: error: expected expression before 'unsigned'
> include/asm-generic/cmpxchg-local.h:61: error: expected expression before 'unsigned'
> In file included from include/asm/bitops.h:19,
>                  from include/linux/bitops.h:17,
>                  from include/linux/kernel.h:15,
>                  from include/linux/sched.h:52,
>                  from arch/frv/kernel/asm-offsets.c:7:
> include/asm/system.h: In function '__cmpxchg_local':
> include/asm/system.h:279: error: variable or field '__xg_orig' declared void
> include/asm/system.h:279: error: variable or field '__xg_test' declared void
> include/asm/system.h:279: error: variable or field '__xg_new' declared void
> include/asm/system.h:279: error: void value not ignored as it ought to be
> make[1]: *** [arch/frv/kernel/asm-offsets.s] Error 1
> 
> <--  snip  -->
> 
> 
> An architecture specific patch that breaks the one architecture it 
> touches at the first file being compiled is even for kernel standards 
> unusually bad...
> 

I did this cmpxchg_local patchset to support Christoph Lameter's slub
performance improvement work. It implies touching every kernel
architecture. Each architecture is touched by a different patch. And no,
I did not happen to have an FRV toolchain handy. Sorry. I'll dig into
this.

Mathieu


> 
> cu
> Adrian
> 
> -- 
> 
>        "Is there not promise of rain?" Ling Tan asked suddenly out
>         of the darkness. There had been need of rain for many days.
>        "Only a promise," Lao Er said.
>                                        Pearl S. Buck - Dragon Seed
> 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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