From: Hailong Liu <[email protected]> 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 <[email protected]> --- 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
