linux-kernel - Re: [PATCH 1/7] rcu: fix incorrect conditional compilation

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Date:   Tue, 15 Oct 2019 20:35:22 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Lai Jiangshan <laijs@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org
Subject: Re: [PATCH 1/7] rcu: fix incorrect conditional compilation

On Tue, Oct 15, 2019 at 10:23:56AM +0000, Lai Jiangshan wrote:
> DO NOT pick it to stable tree.
> (Since the title has "fix", this statement may help stop
> AI pick it to stable tree)
> 
> The tokens SRCU and TINY_RCU are not defined by any configurations,
> they should be CONFIG_SRCU and CONFIG_TINY_RCU. But there is no
> harm when "TINY_RCU" is wrongly used, which are always non-defined,
> which makes "!defined(TINY_RCU)" always true, which means
> the code block is always inclued, and the included code block
> doesn't cause any compilation error so far when CONFIG_TINY_RCU.
> It is also the reason this change doesn't need for stable.
> 
> Signed-off-by: Lai Jiangshan <jiangshanlai@...il.com>
> Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>

Applied for review and testing, thank you!

							Thanx, Paul

> ---
>  kernel/rcu/rcu.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
> index a7ab2a023dd3..05f936ed167a 100644
> --- a/kernel/rcu/rcu.h
> +++ b/kernel/rcu/rcu.h
> @@ -254,7 +254,7 @@ void rcu_test_sync_prims(void);
>   */
>  extern void resched_cpu(int cpu);
>  
> -#if defined(SRCU) || !defined(TINY_RCU)
> +#if defined(CONFIG_SRCU) || !defined(CONFIG_TINY_RCU)
>  
>  #include <linux/rcu_node_tree.h>
>  
> @@ -391,7 +391,7 @@ do {									\
>  #define raw_lockdep_assert_held_rcu_node(p)				\
>  	lockdep_assert_held(&ACCESS_PRIVATE(p, lock))
>  
> -#endif /* #if defined(SRCU) || !defined(TINY_RCU) */
> +#endif /* #if defined(CONFIG_SRCU) || !defined(CONFIG_TINY_RCU) */
>  
>  #ifdef CONFIG_SRCU
>  void srcu_init(void);
> -- 
> 2.20.1
>