linux-kernel - Re: [patch 11/17] hugetlbfs: support larger than MAX

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Date:	Fri, 11 Apr 2008 10:59:28 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	akpm@...ux-foundation.org, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, pj@....com,
	kniht@...ux.vnet.ibm.com
Subject: Re: [patch 11/17] hugetlbfs: support larger than MAX_ORDER

On Fri, Apr 11, 2008 at 10:13:17AM +0200, Andi Kleen wrote:
> >  	spin_lock(&hugetlb_lock);
> > -	if (h->surplus_huge_pages_node[nid]) {
> > +	if (h->surplus_huge_pages_node[nid] && h->order <= MAX_ORDER) {
> 
> As Andrew Hastings pointed out earlier this all needs to be h->order < MAX_ORDER
> [got pretty much all the checks wrong off by one]. It won't affect anything
> on x86-64 but might cause problems on archs which have exactly MAX_ORDER
> sized huge pages.

Ah, hmm, I might have missed a couple of emails worth of feedback when
you last posted. Thanks for pointing this out, I'll read over them again.

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