When memblock_reserve() fails because memblock.reserved.regions cannot
be resized, the caller (e.g. alloc_bootmem()) is not informed of the
failed allocation. Therefore alloc_bootmem() silently returns the same
pointer again and again.
This patch adds a check for the return value of memblock_reserve() in
__alloc_memory_core().
Signed-off-by: Philipp Hachtmann <pha...@linux.vnet.ibm.com>
---
mm/nobootmem.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 2c254d3..3a7e14d 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -45,7 +45,9 @@ static void * __init __alloc_memory_core_early(int nid, u64
size, u64 align,
if (!addr)
return NULL;
- memblock_reserve(addr, size);
+ if (memblock_reserve(addr, size))
+ return NULL;
+
ptr = phys_to_virt(addr);
memset(ptr, 0, size);
/*
--
1.8.4.5
--
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