From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753447AbeE3L3J (ORCPT ); Wed, 30 May 2018 07:29:09 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:60919 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752247AbeE3LHF (ORCPT ); Wed, 30 May 2018 07:07:05 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Josh Poimboeuf" , "Boris Ostrovsky" , "Andy Lutomirski" , "Peter Zijlstra" , "Thomas Gleixner" , "Jan Beulich" , "Juergen Gross" , "Jan Beulich" , "Ingo Molnar" , "H. Peter Anvin" , "Brian Gerst" , "Linus Torvalds" , "Borislav Petkov" , "Denys Vlasenko" Date: Wed, 30 May 2018 11:52:41 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 101/153] x86/mm: Fix {pmd,pud}_{set,clear}_flags() In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.102-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Jan Beulich commit 842cef9113c2120f74f645111ded1e020193d84c upstream. Just like pte_{set,clear}_flags() their PMD and PUD counterparts should not do any address translation. This was outright wrong under Xen (causing a dead boot with no useful output on "suitable" systems), and produced needlessly more complicated code (even if just slightly) when paravirt was enabled. Signed-off-by: Jan Beulich Reviewed-by: Juergen Gross Acked-by: Thomas Gleixner Cc: Andy Lutomirski Cc: Boris Ostrovsky Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/5A8AF1BB02000078001A91C3@prv-mh.provo.novell.com Signed-off-by: Ingo Molnar [bwh: Backported to 3.2: - There aren't any pud_{set,clear}_flags() functions - There's no p4d level] Signed-off-by: Ben Hutchings --- --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -254,14 +254,14 @@ static inline pmd_t pmd_set_flags(pmd_t { pmdval_t v = native_pmd_val(pmd); - return __pmd(v | set); + return native_make_pmd(v | set); } static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) { pmdval_t v = native_pmd_val(pmd); - return __pmd(v & ~clear); + return native_make_pmd(v & ~clear); } static inline pmd_t pmd_mkold(pmd_t pmd) --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -271,6 +271,11 @@ static inline pmdval_t native_pmd_val(pm #else #include +static inline pmd_t native_make_pmd(pmdval_t val) +{ + return (pmd_t) { .pud.pgd = native_make_pgd(val) }; +} + static inline pmdval_t native_pmd_val(pmd_t pmd) { return native_pgd_val(pmd.pud.pgd);