From: Hailong Liu <liu.hailong6@xxxxxxxxxx>
When system in the booting stage, pages span from [start, end] of a memblock
are freed to buddy in a order as large as possible (less than MAX_ORDER) at
first, then decrease gradually to a proper order(less than end) in a loop.
However, *min(MAX_ORDER - 1UL, __ffs(start))* can not get the largest order
in some cases.
Instead, *__ffs(end - start)* may be more appropriate and meaningful.
Signed-off-by: Hailong Liu <liu.hailong6@xxxxxxxxxx>
---
mm/memblock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memblock.c b/mm/memblock.c
index b68ee8678..7c6d0dde7 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1931,7 +1931,7 @@ static void __init __free_pages_memory(unsigned long start, unsigned long end)
int order;
while (start < end) {
- order = min(MAX_ORDER - 1UL, __ffs(start));
+ order = min(MAX_ORDER - 1UL, __ffs(end - start));
while (start + (1UL << order) > end)
order--;
--
2.17.1
