From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932493AbbFIJlu (ORCPT ); Tue, 9 Jun 2015 05:41:50 -0400 Received: from mx5.ptsecurity.com ([45.58.112.35]:24403 "EHLO mx5.ptsecurity.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750868AbbFIJlb (ORCPT ); Tue, 9 Jun 2015 05:41:31 -0400 From: Alexander Popov To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Andrey Konovalov , "Andrew Morton" , Andrey Ryabinin , Andy Lutomirski , Alexander Kuleshov , Denys Vlasenko , "Borislav Petkov" , Peter Zijlstra , Kees Cook , Alexander Popov , , Subject: [PATCH v5 1/2] x86_64: remove not needed clear_page for init_level4_page Date: Tue, 9 Jun 2015 12:42:00 +0300 Message-ID: <1433842921-18055-2-git-send-email-alpopov@ptsecurity.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433842921-18055-1-git-send-email-alpopov@ptsecurity.com> References: <1433842921-18055-1-git-send-email-alpopov@ptsecurity.com> MIME-Version: 1.0 Content-Type: text/plain X-ClientProxiedBy: DC1-CAS-02.ptsecurity.ru (10.0.52.115) To DC1-MBX-02.ptsecurity.ru (10.0.52.117) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrey Ryabinin Commit 8170e6bed465 ("x86, 64bit: Use a #PF handler to materialize early mappings on demand") introduced clear_page(init_level4_pgt); call in x86_64_start_kernel(). However, this clear_page is useless because init_level4_page already filled with zeroes in head_64.S Commit message in 8170e6bed465 says that this clear_page() was dropped in v7, but it accidentally reappeared in later versions of that patchset. Signed-off-by: Andrey Ryabinin --- arch/x86/kernel/head64.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 5a46681..6a6eefd 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -177,7 +177,6 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) */ load_ucode_bsp(); - clear_page(init_level4_pgt); /* set init_level4_pgt kernel high mapping*/ init_level4_pgt[511] = early_level4_pgt[511]; -- 1.9.1