linux-kernel - Re: [PATCH] [4/4] SCHED: Use a lookup array in sd_level_to

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Date:	Wed, 12 Nov 2008 15:47:09 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH] [4/4] SCHED: Use a lookup array in sd_level_to_string

On Wed, Nov 12, 2008 at 01:45:12PM +0100, Andi Kleen wrote:
> 
> Generates better/shorter code. Doesn't matter much because it's only
> a SCHED_DEBUG function. 
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> ---
>  kernel/sched.c |   29 +++++++++++------------------
>  1 file changed, 11 insertions(+), 18 deletions(-)
> 
> Index: linux-2.6.28-rc4-test/kernel/sched.c
> ===================================================================
> --- linux-2.6.28-rc4-test.orig/kernel/sched.c	2008-11-12 12:36:23.000000000 +0100
> +++ linux-2.6.28-rc4-test/kernel/sched.c	2008-11-12 12:43:58.000000000 +0100
> @@ -6629,24 +6629,17 @@
>  
>  static inline const char *sd_level_to_string(enum sched_domain_level lvl)
>  {
> -	switch (lvl) {
> -	case SD_LV_NONE:
> -			return "NONE";
> -	case SD_LV_SIBLING:
> -			return "SIBLING";
> -	case SD_LV_MC:
> -			return "MC";
> -	case SD_LV_CPU:
> -			return "CPU";
> -	case SD_LV_NODE:
> -			return "NODE";
> -	case SD_LV_ALLNODES:
> -			return "ALLNODES";
> -	case SD_LV_MAX:
> -			return "MAX";
> -
> -	}
> -	return "MAX";
> +	static const char *lva[] = {
> +#define T(x) [SD_LV_ ## x ] = #T

Shouldn't                         ^ that be x?

	Hannes
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