linux-kernel - Re: [PATCH 1/3] mm, mem-hotplug: fix section mismatch. setup_per_zone_inactive_ratio() should be _

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Message-Id: <20110412192751.B52B.A69D9226@jp.fujitsu.com>
Date:	Tue, 12 Apr 2011 19:28:00 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 1/3] mm, mem-hotplug: fix section mismatch. setup_per_zone_inactive_ratio() should be __meminit.

Hi

> On Mon, Apr 11, 2011 at 5:00 PM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
> > Commit bce7394a3e (page-allocator: reset wmark_min and inactive ratio of
> > zone when hotplug happens) introduced invalid section references.
> > Now, setup_per_zone_inactive_ratio() is marked __init and then it can't
> > be referenced from memory hotplug code.
> >
> > Then, this patch marks it as __meminit and also marks caller as __ref.
> >
> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
> 
> Just a nitpick.
> 
> As below comment of __ref said, It would be better to add _why_ such
> as memory_hotplug.c.
> 
> "so optimally document why the __ref is needed and why it's OK"

Hmm...
All of memory_hotplug.c function can call __meminit function. It's
definition of __meminit.

We can put the same comment to every function in memory_hotplug.c. 
like hotadd_newpgdat().

/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
{
(snip)
}

But it has zero information. ;)



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