linux-kernel - [PATCH v2] mm/page_alloc: check return value of memblock_alloc_node

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Date:   Thu, 17 Jan 2019 16:22:21 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     William Kucharski <william.kucharski@...cle.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH v2] mm/page_alloc: check return value of memblock_alloc_node_nopanic()

There are two early memory allocations that use
memblock_alloc_node_nopanic() and do not check its return value.
While this happens very early during boot and chances that the allocation
will fail are diminishing, it is still worth to have proper checks for the
allocation errors.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
---
v2: add pgdat->node_id to panic message

 mm/page_alloc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d295c9bc01a8..13d5b338f434 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6376,10 +6376,14 @@ static void __ref setup_usemap(struct pglist_data *pgdat,
 {
 	unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize);
 	zone->pageblock_flags = NULL;
-	if (usemapsize)
+	if (usemapsize) {
 		zone->pageblock_flags =
 			memblock_alloc_node_nopanic(usemapsize,
 							 pgdat->node_id);
+		if (!zone->pageblock_flags)
+			panic("Failed to allocate %ld bytes for zone %s pageblock flags on node %d\n",
+			      usemapsize, zone->name, pgdat->node_id);
+	}
 }
 #else
 static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone,
@@ -6609,6 +6613,9 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
 		end = ALIGN(end, MAX_ORDER_NR_PAGES);
 		size =  (end - start) * sizeof(struct page);
 		map = memblock_alloc_node_nopanic(size, pgdat->node_id);
+		if (!map)
+			panic("Failed to allocate %ld bytes for node %d memory map\n",
+			      size, pgdat->node_id);
 		pgdat->node_mem_map = map + offset;
 	}
 	pr_debug("%s: node %d, pgdat %08lx, node_mem_map %08lx\n",
-- 
2.7.4