linux-kernel - Re: [PATCH tip/core/rcu 14/14] rcu: Fix rcu_is_cpu_idle() #ifdef in TINY

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Date:	Fri, 15 Jun 2012 14:28:28 -0700
From:	Josh Triplett <josh@...htriplett.org>
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,
	mathieu.desnoyers@...ymtl.ca, 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,
	fweisbec@...il.com, patches@...aro.org,
	"Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH tip/core/rcu 14/14] rcu: Fix rcu_is_cpu_idle() #ifdef in
 TINY_RCU

On Fri, Jun 15, 2012 at 01:13:15PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paul.mckenney@...aro.org>
> 
> The rcu_is_cpu_idle() function is used if CONFIG_DEBUG_LOCK_ALLOC,
> but TINY_RCU defines it only when CONFIG_PROVE_RCU.  This causes
> build failures when CONFIG_DEBUG_LOCK_ALLOC=y but CONFIG_PROVE_RCU=n.
> This commit therefore adjusts the #ifdefs for rcu_is_cpu_idle() so
> that it is defined when CONFIG_DEBUG_LOCK_ALLOC=y.
> 
> Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Given that an earlier patch in this series makes rcupdate.h
unconditionally prototype rcu_is_cpu_idle, shouldn't rcutiny.c define it
unconditionally?  (And do so before the earlier patch in this series
makes it available unconditionally?)

- Josh Triplett

>  kernel/rcutiny.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
> index 37a5444..547b1fe 100644
> --- a/kernel/rcutiny.c
> +++ b/kernel/rcutiny.c
> @@ -172,7 +172,7 @@ void rcu_irq_enter(void)
>  	local_irq_restore(flags);
>  }
>  
> -#ifdef CONFIG_PROVE_RCU
> +#ifdef CONFIG_DEBUG_LOCK_ALLOC
>  
>  /*
>   * Test whether RCU thinks that the current CPU is idle.
> @@ -183,7 +183,7 @@ int rcu_is_cpu_idle(void)
>  }
>  EXPORT_SYMBOL(rcu_is_cpu_idle);
>  
> -#endif /* #ifdef CONFIG_PROVE_RCU */
> +#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
>  
>  /*
>   * Test whether the current CPU was interrupted from idle.  Nested
> -- 
> 1.7.8
> 
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