When start_pfn equals end_pfn, __free_pages_memory() takes no effect and __free_memory_core() will finally return (end_pfn - start_pfn) = 0.
This patch returns 0 directly when start_pfn equals end_pfn. Signed-off-by: Wei Yang <[email protected]> --- mm/nobootmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/nobootmem.c b/mm/nobootmem.c index 487dad610731..36454d0f96ee 100644 --- a/mm/nobootmem.c +++ b/mm/nobootmem.c @@ -118,7 +118,7 @@ static unsigned long __init __free_memory_core(phys_addr_t start, unsigned long end_pfn = min_t(unsigned long, PFN_DOWN(end), max_low_pfn); - if (start_pfn > end_pfn) + if (start_pfn >= end_pfn) return 0; __free_pages_memory(start_pfn, end_pfn); -- 2.11.0
