linux-kernel - Re: [PATCH 03/10] x86: arch/x86/Kconfig.cpu unification

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Date:	Tue, 6 Nov 2007 03:46:30 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Brian Gerst <bgerst@...ntduck.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/10] x86: arch/x86/Kconfig.cpu unification

On Mon, Nov 05, 2007 at 07:53:39PM -0500, Brian Gerst wrote:
> Sam Ravnborg wrote:
> > Move all CPU definitions to Kconfig.cpu
> 
> This patch causes build failure on x86_64:
> 
> lib/rwsem.c: In function ‘__init_rwsem’:
> lib/rwsem.c:24: error: ‘struct rw_semaphore’ has no member named ‘count’
> lib/rwsem.c:24: error: ‘RWSEM_UNLOCKED_VALUE’ undeclared (first use in
> this function)
> lib/rwsem.c:24: error: (Each undeclared identifier is reported only once
> lib/rwsem.c:24: error: for each function it appears in.)
> lib/rwsem.c: In function ‘__rwsem_do_wake’:
> lib/rwsem.c:64: error: implicit declaration of function
> ‘rwsem_atomic_update’
> lib/rwsem.c:64: error: ‘RWSEM_ACTIVE_BIAS’ undeclared (first use in this
> function)
> lib/rwsem.c:66: error: ‘RWSEM_ACTIVE_MASK’ undeclared (first use in this
> function)
> lib/rwsem.c:115: error: ‘RWSEM_WAITING_BIAS’ undeclared (first use in
> this function)
> lib/rwsem.c:120: error: implicit declaration of function ‘rwsem_atomic_add’
> lib/rwsem.c: In function ‘rwsem_down_failed_common’:
> lib/rwsem.c:169: error: ‘RWSEM_ACTIVE_MASK’ undeclared (first use in
> this function)
> lib/rwsem.c: In function ‘rwsem_down_read_failed’:
> lib/rwsem.c:197: error: ‘RWSEM_WAITING_BIAS’ undeclared (first use in
> this function)
> lib/rwsem.c:197: error: ‘RWSEM_ACTIVE_BIAS’ undeclared (first use in
> this function)
> lib/rwsem.c: In function ‘rwsem_down_write_failed’:
> lib/rwsem.c:210: error: ‘RWSEM_ACTIVE_BIAS’ undeclared (first use in
> this function)
> 
> git bisect gives:
> 55432d383871d127685d78f94e0ad60307dcc0e9 is first bad commit
> commit 55432d383871d127685d78f94e0ad60307dcc0e9
> Author: Sam Ravnborg <sam@...nborg.org>
> Date:   Thu Nov 1 21:54:39 2007 +0100
> 
>     x86: arch/x86/Kconfig.cpu unification

Seems that a default value fail to change value when we shift
from 32 to 64 bit. I have it reproduced here.
Will look at it tonight.

	Sam
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