linux-kernel - Re: [PATCH 2/3] slub: record page flag overlays explicitly

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Date:	Wed, 28 May 2008 01:06:55 +0900
From:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To:	apw@...dowen.org
Cc:	linux-mm@...ck.org, "Andrew Morton" <akpm@...l.org>,
	"Christoph Lameter" <clameter@....com>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Rik van Riel" <riel@...hat.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] slub: record page flag overlays explicitly

>> > -           if (SlabDebug(page))
>> > -                   printk(KERN_ERR "SLUB %s: SlabDebug set on "
>> > +           if (PageSlubDebug(page))
>> > +                   printk(KERN_ERR "SLUB %s: SlubDebug set on "
>> >                             "slab 0x%p\n", s->name, page);
>> >     }
>> >  }
>>
>> Why if(SLABDEBUG) check is unnecessary?
>
> They were unconditional before as well.  SlabDebug would always return
> 0 before the patch.  The point being, to my reading, that if you asked
> for debug on the slab and debug was not compiled in you would still get
> told that it was not set; which it cannot without the support.

Thank you explain!

  Tested-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
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