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

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Message-Id: <20070713011543.22797645.akpm@linux-foundation.org>
Date:	Fri, 13 Jul 2007 01:15:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joe Jin <joe.jin@...cle.com>
Cc:	bill.irwin@...cle.com, linux-kernel@...r.kernel.org,
	gurudas.pai@...cle.com, Paul Jackson <pj@....com>
Subject: Re: [PATCH] Add nid sanity on alloc_pages_node

On Fri, 13 Jul 2007 16:03:36 +0800 Joe Jin <joe.jin@...cle.com> wrote:

> > > 
> > > The patch looks good for this bug, thanks :)
> > 
> > If you have time could you test it and sent it back at me please?
> > 
> 
> Test passed and panic gone.

Patch gone too ;) I deleted it.  I was hoping that you'd send me the final
finished product (please).

> thanks.
> 
> > > if other caller give a invalid nid to alloc_pages_node(), __alloc_pages
> > > will crash again.
> > 
> > That would be a buggy caller, so we should fix that caller.
> > 
> > > So I think we add some sanity check for nid at alloc_pages_node is
> > > meaningful.  
> > > 
> > > another question, if (nid >= MAX_NUMNODES),  may I set nid to 0 directly
> > > like following code?
> > > 
> > > 	if (unlikly(nid >= MAX_NUMNODES)
> > > 		nid = 0
> > 
> > if (nid > MAX_NUMNODES) then that is a bug and we should report it (doing
> > this via a BUG() is OK) rather than quietly covering it up.
> > 
> > if (nid == MAX_NUMNODES) then we should set it to
> > first_node(node_online_map);
> 
> OK, will do it and send you a patch :)

Thanks.  Please cc Paul Jackson <pj@....com> on that patch.
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