linux-kernel - Re: [PATCH v5 08/45] CPU hotplug: Convert preprocessor macros to static inline functions

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Date:	Fri, 8 Feb 2013 15:51:22 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, rusty@...tcorp.com.au, mingo@...nel.org,
	akpm@...ux-foundation.org, namhyung@...nel.org,
	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	fweisbec@...il.com, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/45] CPU hotplug: Convert preprocessor macros to
 static inline functions

On Tue, Jan 22, 2013 at 01:05:02PM +0530, Srivatsa S. Bhat wrote:
> On 12/05/2012 06:10 AM, Andrew Morton wrote:
> "static inline C functions would be preferred if possible.  Feel free to
> fix up the wrong crufty surrounding code as well ;-)"
> 
> Convert the macros in the CPU hotplug code to static inline C functions.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> ---
> 
>  include/linux/cpu.h |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/cpu.h b/include/linux/cpu.h
> index cf24da1..eb79f47 100644
> --- a/include/linux/cpu.h
> +++ b/include/linux/cpu.h
> @@ -198,10 +198,10 @@ static inline void cpu_hotplug_driver_unlock(void)
> 
>  #else		/* CONFIG_HOTPLUG_CPU */
> 
> -#define get_online_cpus()	do { } while (0)
> -#define put_online_cpus()	do { } while (0)
> -#define get_online_cpus_atomic()	do { } while (0)
> -#define put_online_cpus_atomic()	do { } while (0)
> +static inline void get_online_cpus(void) {}
> +static inline void put_online_cpus(void) {}
> +static inline void get_online_cpus_atomic(void) {}
> +static inline void put_online_cpus_atomic(void) {}
>  #define hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
>  /* These aren't inline functions due to a GCC bug. */
>  #define register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
> 

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