Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758641AbZCXJoi (ORCPT ); Tue, 24 Mar 2009 05:44:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755170AbZCXJo3 (ORCPT ); Tue, 24 Mar 2009 05:44:29 -0400 Received: from hera.kernel.org ([140.211.167.34]:50604 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755912AbZCXJo2 (ORCPT ); Tue, 24 Mar 2009 05:44:28 -0400 Date: Tue, 24 Mar 2009 09:42:29 GMT From: "Pallipadi, Venkatesh" To: linux-tip-commits@vger.kernel.org Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, venkatesh.pallipadi@intel.com, jbarnes@virtuousgeek.org, kjwinchester@gmail.com, suresh.b.siddha@intel.com, airlied@redhat.com, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, venkatesh.pallipadi@intel.com, jbarnes@virtuousgeek.org, kjwinchester@gmail.com, suresh.b.siddha@intel.com, airlied@redhat.com, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <20090323190720.GA16831@linux-os.sc.intel.com> References: <20090323190720.GA16831@linux-os.sc.intel.com> Subject: [tip:x86/pat] x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot Message-ID: Git-Commit-ID: 571d1692d564e7782e55738ee87099fa038a3778 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Tue, 24 Mar 2009 09:42:32 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1979 Lines: 53 Commit-ID: 571d1692d564e7782e55738ee87099fa038a3778 Gitweb: http://git.kernel.org/tip/571d1692d564e7782e55738ee87099fa038a3778 Author: Pallipadi, Venkatesh AuthorDate: Mon, 23 Mar 2009 12:07:20 -0700 Committer: Ingo Molnar CommitDate: Tue, 24 Mar 2009 10:41:38 +0100 x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot While looking at the issue in the thread: http://marc.info/?l=dri-devel&m=123606627824556&w=2 noticed a bug in pci PAT code and memory type setting. PCI mmap code did not set the proper protection in vma, when it inherited protection in reserve_memtype. This bug only affects the case where there exists a WC mapping before X does an mmap with /proc or /sys pci interface. This will cause X userlevel mmap from /proc or /sysfs to fail on fork. Reported-by: Kevin Winchester Signed-off-by: Venkatesh Pallipadi Signed-off-by: Suresh Siddha Cc: Jesse Barnes Cc: Dave Airlie LKML-Reference: <20090323190720.GA16831@linux-os.sc.intel.com> Signed-off-by: Ingo Molnar --- arch/x86/pci/i386.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c index 5ead808..f234a37 100644 --- a/arch/x86/pci/i386.c +++ b/arch/x86/pci/i386.c @@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, return -EINVAL; } flags = new_flags; + vma->vm_page_prot = __pgprot( + (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) | + flags); } if (((vma->vm_pgoff < max_low_pfn_mapped) || -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/