linux-kernel - [PATCH 2/3] mm, bootmem: panic in bootmem alloc functions even if slab is available

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Date:	Sun, 23 Dec 2012 15:15:07 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	rientjes@...gle.com, Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"David S. Miller" <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
	Joonsoo Kim <js1304@...il.com>,
	Yinghai Lu <yinghai@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH 2/3] mm, bootmem: panic in bootmem alloc functions even if slab is available

Bootmem alloc functions are supposed to panic if allocation fails unless a
*_nopanic() function is used. However, if slab is available this is not the
case currently, and the function might return a NULL.

Currect it to panic on failed allocations even if slab is available.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 mm/bootmem.c   | 9 ---------
 mm/nobootmem.c | 6 ------
 2 files changed, 15 deletions(-)

diff --git a/mm/bootmem.c b/mm/bootmem.c
index 1324cd7..198a92f 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -763,9 +763,6 @@ void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 				   unsigned long align, unsigned long goal)
 {
-	if (WARN_ON_ONCE(slab_is_available()))
-		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
-
 	return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 }
 
@@ -775,9 +772,6 @@ void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 #ifdef MAX_DMA32_PFN
 	unsigned long end_pfn;
 
-	if (WARN_ON_ONCE(slab_is_available()))
-		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
-
 	/* update goal according ...MAX_DMA32_PFN */
 	end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 
@@ -839,9 +833,6 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 				       unsigned long align, unsigned long goal)
 {
-	if (WARN_ON_ONCE(slab_is_available()))
-		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
-
 	return ___alloc_bootmem_node(pgdat, size, align,
 				     goal, ARCH_LOW_ADDRESS_LIMIT);
 }
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index b8294fc..7c4c608 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -371,9 +371,6 @@ void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 				   unsigned long align, unsigned long goal)
 {
-	if (WARN_ON_ONCE(slab_is_available()))
-		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
-
 	return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 }
 
@@ -424,9 +421,6 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 				       unsigned long align, unsigned long goal)
 {
-	if (WARN_ON_ONCE(slab_is_available()))
-		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
-
 	return ___alloc_bootmem_node(pgdat, size, align, goal,
 				     ARCH_LOW_ADDRESS_LIMIT);
 }
-- 
1.8.0

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