linux-kernel - Re: [PATCH tip/core/rcu 07/28] Fix mismatched variable in rcutree

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Message-ID: <BLU0-SMTP6812EDF7FA2A59A528E8FD96620@phx.gbl>
Date:	Wed, 8 Jun 2011 19:23:29 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH tip/core/rcu 07/28] Fix mismatched variable in
	rcutree_trace.c

* Paul E. McKenney (paulmck@...ux.vnet.ibm.com) wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> rcutree.c defines rcu_cpu_kthread_cpu as int, not unsigned int,
> so the extern has to follow that.

How comes this discrepancy was made possible in the first place ? This
declaration should appear in a header included by both rcutree_trace.c
and rcutree.c, which would have permitted the compiler to detect this.

Maybe kernel/rcutree.h would be a good location for these ?

Mathieu

> 
> Cc: paulmck@...ux.vnet.ibm.com
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> ---
>  kernel/rcutree_trace.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
> index 9678cc3..91c56e5 100644
> --- a/kernel/rcutree_trace.c
> +++ b/kernel/rcutree_trace.c
> @@ -47,7 +47,7 @@
>  #include "rcutree.h"
>  
>  DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
> -DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_cpu);
> +DECLARE_PER_CPU(int, rcu_cpu_kthread_cpu);
>  DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
>  DECLARE_PER_CPU(char, rcu_cpu_has_work);
>  
> -- 
> 1.7.3.2
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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