From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932996AbcAHTl1 (ORCPT ); Fri, 8 Jan 2016 14:41:27 -0500 Received: from www.linutronix.de ([62.245.132.108]:39663 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932444AbcAHTlY (ORCPT ); Fri, 8 Jan 2016 14:41:24 -0500 Date: Fri, 8 Jan 2016 20:40:31 +0100 (CET) From: Thomas Gleixner To: Dave Hansen cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, dave.hansen@linux.intel.com Subject: Re: [PATCH 30/31] x86, pkeys: create an x86 arch_calc_vm_prot_bits() for VMA flags In-Reply-To: <20160107000146.EB87C6BA@viggo.jf.intel.com> Message-ID: References: <20160107000104.1A105322@viggo.jf.intel.com> <20160107000146.EB87C6BA@viggo.jf.intel.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001,URIBL_BLOCKED=0.001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 6 Jan 2016, Dave Hansen wrote: > > From: Dave Hansen > > calc_vm_prot_bits() takes PROT_{READ,WRITE,EXECUTE} bits and > turns them in to the vma->vm_flags/VM_* bits. We need to do a > similar thing for protection keys. > > We take a protection key (4 bits) and encode it in to the 4 > VM_PKEY_* bits. > > Note: this code is not new. It was simply a part of the > mprotect_pkey() patch in the past. I broke it out for use > in the execute-only support. > > Signed-off-by: Dave Hansen Reviewed-by: Thomas Gleixner