linux-kernel - [RFC v2 2/4] mm: unify checks in alloc_pages

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Date:	Fri, 24 Jul 2015 16:45:24 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.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>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [RFC v2 2/4] mm: unify checks in alloc_pages_node family of functions

Perform the same debug checks in alloc_pages_node() as are done in
alloc_pages_exact_node() and __alloc_pages_node() by making the latter
function the inner core of the former ones.

Change the !node_online(nid) check from VM_BUG_ON to VM_WARN_ON since it's not
fatal and this patch may expose some buggy callers.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 include/linux/gfp.h | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index c50848e..54c3ee7 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -307,7 +307,8 @@ __alloc_pages(gfp_t gfp_mask, unsigned int order,
 static inline struct page *
 __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
 {
-	VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid));
+	VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
+	VM_WARN_ON(!node_online(nid));
 
 	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
 }
@@ -319,11 +320,11 @@ __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
 						unsigned int order)
 {
-	/* Unknown node is current node */
-	if (nid < 0)
+	/* Unknown node is current (or closest) node */
+	if (nid == NUMA_NO_NODE)
 		nid = numa_node_id();
 
-	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
+	return __alloc_pages_node(nid, gfp_mask, order);
 }
 
 /*
@@ -334,11 +335,7 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
 						unsigned int order)
 {
-	VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid));
-
-	gfp_mask |= __GFP_THISNODE;
-
-	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
+	return __alloc_pages_node(nid, gfp_mask | __GFP_THISNODE, order);
 }
 
 #ifdef CONFIG_NUMA
-- 
2.4.6

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