From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752626Ab3EJJDd (ORCPT ); Fri, 10 May 2013 05:03:33 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:35618 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751788Ab3EJJDa (ORCPT ); Fri, 10 May 2013 05:03:30 -0400 X-IronPort-AV: E=Sophos;i="4.87,647,1363104000"; d="scan'208";a="7233881" Message-ID: <518CB758.4000101@cn.fujitsu.com> Date: Fri, 10 May 2013 17:01:12 +0800 From: Zhang Yanfei User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.8) Gecko/20121012 Thunderbird/10.0.8 MIME-Version: 1.0 To: "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Andrew Morton CC: yinghai@kernel.org, "linux-kernel@vger.kernel.org" Subject: [PATCH] x86: mm: Remove unnecessary assignment for max_pfn_mapped:q X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/05/10 17:02:23, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/05/10 17:02:30, Serialize complete at 2013/05/10 17:02:30 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org init_memory_mapping will set max_pfn_mapped: int_memory_mapping --> add_pfn_range_mapped --> max_pfn_mapped = max(max_pfn_mapped, end_pfn) In init_mem_mapping, before we set max_pfn_mapped to 0, we have already called init_memory_mapping to setup pagetable for [0, ISA_END_ADDRESS], and that sets max_pfn_mapped. So the assignment to 0 is not necessary, remove it. Signed-off-by: Zhang Yanfei Cc: "H. Peter Anvin" Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Konrad Rzeszutek Wilk Cc: Andrew Morton Cc: Yinghai Lu --- arch/x86/mm/init.c | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index fdc5dca..404c889 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -416,7 +416,6 @@ void __init init_mem_mapping(void) /* step_size need to be small so pgt_buf from BRK could cover it */ step_size = PMD_SIZE; - max_pfn_mapped = 0; /* will get exact value next */ min_pfn_mapped = real_end >> PAGE_SHIFT; last_start = start = real_end; while (last_start > ISA_END_ADDRESS) { -- 1.7.1