linux-kernel - Re: [PATCH] add page->mapping handling interface [1/35] interface definitions

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Date:	Fri, 14 Sep 2007 10:06:34 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Richard Knutsson <ricknu-0@...dent.ltu.se>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"nickpiggin@...oo.com.au" <nickpiggin@...oo.com.au>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] add page->mapping handling interface [1/35] interface
 definitions

On Thu, 13 Sep 2007 22:19:20 +0200
Richard Knutsson <ricknu-0@...dent.ltu.se> wrote:
> > +static inline int page_is_pagecache(struct page *page)
> >   
> Why return it as an 'int' instead of 'bool'?
> > +{
> > +	if (!page->mapping || (page->mapping & PAGE_MAPPING_ANON))
> > +		return 0;
> > +	return 1;
> > +}

Ah, I missed bool type just because I have no experience to use 'bool' in
Linux kernel. ok, will try in the next version. thank you.

> >   
> Not easier with 'return page->mapping && (page->mapping & 
> PAGE_MAPPING_ANON) == 0;'?
> > +

yours seems better.


> 
> >  static inline int PageAnon(struct page *page)
> >   
> Change to bool? Then "you" can also remove the '!!' from:
> mm/memory.c:483:                rss[!!PageAnon(page)]++;

Hmm, will try unless it makes diff big.

> >  {
> > -	return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
> > +	return (page->mapping & PAGE_MAPPING_ANON) != 0;
> > +}
> > +
> >   
> <snip>
> 
> If you don't mind bool(eans) (for some reason), I can/will check out the 
> rest.
> 

Thank you. I'll try 'bool' type. 

Regards,
-Kame

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