linux-kernel - [PATCH] mm/sparse: don't check return value of alloc

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Message-Id: <1356030701-16284-30-git-send-email-sasha.levin@oracle.com>
Date:	Thu, 20 Dec 2012 14:11:38 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH] mm/sparse: don't check return value of alloc_bootmem calls

These calls will panic if they can't allocate the memory, so we can
assume that we get actual memory back. This simplifies some functions
and removes unneeded checks.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 mm/sparse.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 6b5fb76..ae64d6e 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -403,15 +403,13 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
 	size = PAGE_ALIGN(size);
 	map = __alloc_bootmem_node_high(NODE_DATA(nodeid), size * map_count,
 					 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
-	if (map) {
-		for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
-			if (!present_section_nr(pnum))
-				continue;
-			map_map[pnum] = map;
-			map += size;
-		}
-		return;
+	for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
+		if (!present_section_nr(pnum))
+			continue;
+		map_map[pnum] = map;
+		map += size;
 	}
+	return;
 
 	/* fallback */
 	for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
@@ -497,8 +495,6 @@ void __init sparse_init(void)
 	 */
 	size = sizeof(unsigned long *) * NR_MEM_SECTIONS;
 	usemap_map = alloc_bootmem(size);
-	if (!usemap_map)
-		panic("can not allocate usemap_map\n");
 
 	for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
 		struct mem_section *ms;
@@ -538,8 +534,6 @@ void __init sparse_init(void)
 #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
 	size2 = sizeof(struct page *) * NR_MEM_SECTIONS;
 	map_map = alloc_bootmem(size2);
-	if (!map_map)
-		panic("can not allocate map_map\n");
 
 	for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
 		struct mem_section *ms;
-- 
1.8.0

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