linux-kernel - Re: [PATCH v3 2/3] mm: unify checks in alloc_pages_node() and __alloc_pages

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Message-ID: <20150730173553.GB15257@cmpxchg.org>
Date:	Thu, 30 Jul 2015 13:35:53 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	cbe-oss-dev@...ts.ozlabs.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 2/3] mm: unify checks in alloc_pages_node() and
 __alloc_pages_node()

On Thu, Jul 30, 2015 at 06:34:30PM +0200, Vlastimil Babka wrote:
> Perform the same debug checks in alloc_pages_node() as are done in
> __alloc_pages_node(), by making the former function a wrapper of the latter
> one.
> 
> In addition to better diagnostics in DEBUG_VM builds for situations which
> have been already fatal (e.g. out-of-bounds node id), there are two visible
> changes for potential existing buggy callers of alloc_pages_node():
> 
> - calling alloc_pages_node() with any negative nid (e.g. due to arithmetic
>   overflow) was treated as passing NUMA_NO_NODE and fallback to local node was
>   applied. This will now be fatal.
> - calling alloc_pages_node() with an offline node will now be checked for
>   DEBUG_VM builds. Since it's not fatal if the node has been previously online,
>   and this patch may expose some existing buggy callers, change the VM_BUG_ON
>   in __alloc_pages_node() to VM_WARN_ON.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> Acked-by: David Rientjes <rientjes@...gle.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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