linux-kernel - Re: [tip:core/urgent] lockdep: warn about lockdep disabling after kernel taint, fix

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Message-ID: <20090414114553.GB5994@nowhere>
Date:	Tue, 14 Apr 2009 13:45:54 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, davem@...emloft.net,
	tglx@...utronix.de, sfr@...b.auug.org.au, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/urgent] lockdep: warn about lockdep disabling after
	kernel taint, fix

On Tue, Apr 14, 2009 at 09:15:38AM +0000, tip-bot for Ingo Molnar wrote:
> Commit-ID:  27b19565fe4ca5b0e9d2ae98ce4b81ca728bf445
> Gitweb:     http://git.kernel.org/tip/27b19565fe4ca5b0e9d2ae98ce4b81ca728bf445
> Author:     Ingo Molnar <mingo@...e.hu>
> AuthorDate: Tue, 14 Apr 2009 11:03:12 +0200
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Tue, 14 Apr 2009 11:11:52 +0200
> 
> lockdep: warn about lockdep disabling after kernel taint, fix
> 
> Impact: build fix for Sparc and s390
> 
> Stephen Rothwell reported that the Sparc build broke:
> 
>  In file included from kernel/panic.c:12:
>  include/linux/debug_locks.h: In function '__debug_locks_off':
>  include/linux/debug_locks.h:15: error: implicit declaration of function 'xchg'
> 
> due to:
> 
>  9eeba61: lockdep: warn about lockdep disabling after kernel taint
> 
> There is some inconsistency between architectures about where exactly
> xchg() is defined.
> 
> The traditional place is in system.h but the more logical point for it
> is in atomic.h - where most architectures (especially new ones) have
> it defined. These architecture also still offer it via system.h.
> 
> Some, such as Sparc or s390 only have it in asm/system.h and not available
> via asm/atomic.h at all.
> 
> Use the widest set of headers in debug_locks.h and also include asm/system.h.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> LKML-Reference: <20090414144317.026498df.sfr@...b.auug.org.au>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> 
> ---
>  include/linux/debug_locks.h |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/debug_locks.h b/include/linux/debug_locks.h
> index 493dedb..29b3ce3 100644
> --- a/include/linux/debug_locks.h
> +++ b/include/linux/debug_locks.h
> @@ -3,6 +3,7 @@
>  
>  #include <linux/kernel.h>
>  #include <asm/atomic.h>
> +#include <asm/system.h>
>  
>  struct task_struct;
>  



I'm sorry about this build breakage...

I've grep'ed the definitions of xchg() for this pach and indeed remember
that some architectures defined it in asm/atomic.h and
others in asm/system.h

And I've also seen some of them including system.h from
atomic.h so I thought it was safe but.. heh...

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