From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adrian Bunk <bunk@stusta.de>
Date: Thu, 26 Jan 2006 08:15:02 +0000
Subject: Re: [KJ] [Patch 8/9] BUG_ON() Conversion in md/raid6main.c
Message-Id: <20060126081502.GW3590@stusta.de>
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On Wed, Jan 25, 2006 at 04:35:14PM -0800, Greg KH wrote:
> On Thu, Jan 26, 2006 at 01:00:43AM +0100, Eric Sesterhenn / snakebyte wrote:
> > hi,
> > 
> > this changes if() BUG(); constructs to BUG_ON() which is
> > cleaner and can better optimized away
> > 
> > Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
> > 
> > --- linux-2.6.16-rc1-git4/drivers/md/raid6main.c.orig	2006-01-26 00:30:19.000000000 +0100
> > +++ linux-2.6.16-rc1-git4/drivers/md/raid6main.c	2006-01-26 00:32:31.000000000 +0100
> > @@ -91,10 +91,8 @@ static void print_raid6_conf (raid6_conf
> >  static void __release_stripe(raid6_conf_t *conf, struct stripe_head *sh)
> >  {
> >  	if (atomic_dec_and_test(&sh->count)) {
> > -		if (!list_empty(&sh->lru))
> > -			BUG();
> > -		if (atomic_read(&conf->active_stripes)==0)
> > -			BUG();
> > +		BUG_ON(!list_empty(&sh->lru));
> > +		BUG_ON(atomic_read(&conf->active_stripes)==0);
> 
> Also, no, do not do this!
> If BUG_ON() is turned off, then the logic changes here.

That's wrong, the CONFIG_BUG=n case in include/asm-generic/bug.h is:

  #define BUG_ON(condition) do { if (condition) ; } while(0)


> thanks,
> 
> greg k-h

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed


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