From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751287AbdEBNQ1 (ORCPT ); Tue, 2 May 2017 09:16:27 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:34692 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750713AbdEBNQY (ORCPT ); Tue, 2 May 2017 09:16:24 -0400 From: Wei Yang To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang Subject: [PATCH] mm/nobootmem: return 0 when start_pfn equals end_pfn Date: Tue, 2 May 2017 21:11:15 +0800 Message-Id: <20170502131115.6650-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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