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

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Date:	Wed, 12 Nov 2008 19:43:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	peterz@...radead.org
Subject: Re: [PATCH] [4/4] SCHED: Use a lookup array in sd_level_to_string


* Johannes Weiner <hannes@...xchg.org> wrote:

> 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?

hasnt been tested i guess. Note that the patch is moot: an equivalent 
change has been done in the scheduler tree already, in a cleaner way. 
It's all in linux-next.

	Ingo
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