From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
When checking the indicated address belongs to the memory
or reserved region, the memory or reserved regions are checked
one by one through binary search, which would be a little
time consuming. If the indicated address isn't in memory
region, then we needn't do the time-sonsuming search. The
patch adds more check on the indicated address for that purpose.
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
---
mm/memblock.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/mm/memblock.c b/mm/memblock.c
index 2feff8d..880e461 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -871,6 +871,10 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
{
unsigned int left = 0, right = type->cnt;
+ if (unlikely(addr < memblock_start_of_DRAM() ||
+ addr >= memblock_end_of_DRAM()))
+ return 0;
+
do {
unsigned int mid = (right + left) / 2;
--
1.7.5.4
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>