linux-kernel - Re: [RFC][PATCH v2 4/8] Replace page_referenced() with wipe_page

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Message-Id: <20091211082410.257D.A69D9226@jp.fujitsu.com>
Date:	Fri, 11 Dec 2009 08:46:25 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	lwoodman@...hat.com
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC][PATCH v2  4/8] Replace page_referenced() with wipe_page_reference()

> KOSAKI Motohiro wrote:
> > @@ -578,7 +577,9 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> >
> > +		struct page_reference_context refctx = {
> > +			.is_page_locked = 1,
> >
> >   *
> > @@ -1289,7 +1291,6 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
> >
> > +		struct page_reference_context refctx = {
> > +			.is_page_locked = 0,
> > +		};
> > +
> >   
> are these whole structs properly initialized on the kernel stack?

Yes. C spec says

3.5.7 Initialization

Syntax

          initializer:
                  assignment-expression
                  {  initializer-list } 
                  {  initializer-list , }

          initializer-list:
                  initializer
                  initializer-list ,  initializer
(snip)

   If there are fewer initializers in a list than there are members of
an aggregate, the remainder of the aggregate shall be initialized
implicitly the same as objects that have static storage duration.

Referenced to
  Draft ANSI C Standard (ANSI X3J11/88-090) (May 13, 1988) http://flash-gordon.me.uk/ansi.c.txt


Probably, google "{0}" help your understand to initializer in C.




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