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

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Date:	Fri, 13 Jul 2007 16:03:36 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joe Jin <joe.jin@...cle.com>, bill.irwin@...cle.com,
	linux-kernel@...r.kernel.org, gurudas.pai@...cle.com
Subject: Re: [PATCH] Add nid sanity on alloc_pages_node

> > 
> > 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.
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 :)
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