linux-kernel - Re: [PATCH] rcu: declare rcu_data variables in the section they are defined in

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Date:	Sun, 3 May 2015 12:27:02 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Nicolas Iooss <nicolas.iooss_linux@....org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: declare rcu_data variables in the section they are
 defined in

On Sun, May 03, 2015 at 05:57:53PM +0800, Nicolas Iooss wrote:
> Commit 11bbb235c26f ("rcu: Use DEFINE_PER_CPU_SHARED_ALIGNED for
> rcu_data") replaced DEFINE_PER_CPU by DEFINE_PER_CPU_SHARED_ALIGNED in
> the definition of rcu_sched and rcu_bh without updating
> kernel/rcu/tree.h.
> 
> This makes clang report a section mismatch (-Wsection warning) when
> building LLVMLinux because the variables are declared in .data..percpu
> but defined in .data..percpu..shared_aligned.
> 
> Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>

Good catch.
Reviewed-by: Josh Triplett <josh@...htriplett.org>

> ---
>  kernel/rcu/tree.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
> index a69d3dab2ec4..c5e85b27a79f 100644
> --- a/kernel/rcu/tree.h
> +++ b/kernel/rcu/tree.h
> @@ -519,10 +519,10 @@ extern struct list_head rcu_struct_flavors;
>   * RCU implementation internal declarations:
>   */
>  extern struct rcu_state rcu_sched_state;
> -DECLARE_PER_CPU(struct rcu_data, rcu_sched_data);
> +DECLARE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_sched_data);
>  
>  extern struct rcu_state rcu_bh_state;
> -DECLARE_PER_CPU(struct rcu_data, rcu_bh_data);
> +DECLARE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_bh_data);
>  
>  #ifdef CONFIG_PREEMPT_RCU
>  extern struct rcu_state rcu_preempt_state;
> -- 
> 2.3.6
> 
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