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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-06 15:39:07 -0700
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-08-05 12:56:13 +1000
commit449e8df39d3f94a69deae8341f157f6ef5999015 (patch)
tree75d797caf68e11d7577218e007bdf6f79326c134 /mm/memblock.c
parentbf23c51f1f49d3960f3cd8e3d2e7f943d9c41042 (diff)
downloadlwn-449e8df39d3f94a69deae8341f157f6ef5999015.tar.gz
lwn-449e8df39d3f94a69deae8341f157f6ef5999015.zip
memblock: Add debug markers at the end of the array
Since we allocate one more than needed, why not do a bit of sanity checking here to ensure we don't walk past the end of the array ? Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'mm/memblock.c')
-rw-r--r--mm/memblock.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index 3c474502d92b..a925866e1455 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/bitops.h>
+#include <linux/poison.h>
#include <linux/memblock.h>
struct memblock memblock;
@@ -112,6 +113,10 @@ void __init memblock_init(void)
memblock.reserved.regions = memblock_reserved_init_regions;
memblock.reserved.max = INIT_MEMBLOCK_REGIONS;
+ /* Write a marker in the unused last array entry */
+ memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
+ memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
+
/* Create a dummy zero size MEMBLOCK which will get coalesced away later.
* This simplifies the memblock_add() code below...
*/
@@ -131,6 +136,12 @@ void __init memblock_analyze(void)
{
int i;
+ /* Check marker in the unused last array entry */
+ WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
+ != (phys_addr_t)RED_INACTIVE);
+ WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
+ != (phys_addr_t)RED_INACTIVE);
+
memblock.memory_size = 0;
for (i = 0; i < memblock.memory.cnt; i++)