linux-kernel - Re: [PATCH] Add nid sanity on alloc_pages

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Date:	Thu, 12 Jul 2007 23:57:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joe Jin <joe.jin@...cle.com>, bill.irwin@...cle.com,
	linux-kernel@...r.kernel.org, gurudas.pai@...cle.com
Cc:	Paul Jackson <pj@....com>
Subject: Re: [PATCH] Add nid sanity on alloc_pages_node

On Thu, 12 Jul 2007 23:49:38 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:

> first_node(node_online_map);

Incidentally, we have a helper for this operation:

#if MAX_NUMNODES > 1
...
#define first_online_node	first_node(node_online_map)
...
#else
...
#define first_online_node	0
...
#endif

So I suppose we should use that - it should generate better code for
non-NUMA builds.

It's a pretty sadly implemented helper though.  It should be
"first_online_node()", not "first_online_node".

I'm scratching my head over that min_t in __first_node(), too.   I don't think
it's possible for find_first_bit(..., N) to return anything >N _anyway_.  And if
it does, we want to know about it.

<looks at Paul>
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