From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id 5D6656B02F2 for ; Tue, 2 May 2017 09:16:25 -0400 (EDT) Received: by mail-pg0-f70.google.com with SMTP id q4so4285372pga.4 for ; Tue, 02 May 2017 06:16:25 -0700 (PDT) Received: from mail-pf0-x242.google.com (mail-pf0-x242.google.com. [2607:f8b0:400e:c00::242]) by mx.google.com with ESMTPS id n11si14647337pgd.201.2017.05.02.06.16.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 02 May 2017 06:16:24 -0700 (PDT) Received: by mail-pf0-x242.google.com with SMTP id b23so17226263pfc.0 for ; Tue, 02 May 2017 06:16:24 -0700 (PDT) From: 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> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org