Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754208AbcDZX5D (ORCPT ); Tue, 26 Apr 2016 19:57:03 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:40312 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754122AbcDZXOL (ORCPT ); Tue, 26 Apr 2016 19:14:11 -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, "Sebastian Ott" , "Martin Schwidefsky" Date: Wed, 27 Apr 2016 01:02:21 +0200 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 098/217] s390/pci: enforce fmb page boundary rule In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8426:ae4:c500:9cba:69ae:962d:6167 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 Content-Length: 1591 Lines: 48 3.16.35-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Ott commit 80c544ded25ac14d7cc3e555abb8ed2c2da99b84 upstream. The function measurement block must not cross a page boundary. Ensure that by raising the alignment requirement to the smallest power of 2 larger than the size of the fmb. Fixes: d0b088531 ("s390/pci: performance statistics and debug infrastructure") Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- arch/s390/include/asm/pci.h | 2 +- arch/s390/pci/pci.c | 5 ++++- 2 files changed, 5 insertions(+), 2 deletions(-) --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -48,7 +48,7 @@ struct zpci_fmb { atomic64_t allocated_pages; atomic64_t mapped_pages; atomic64_t unmapped_pages; -} __packed __aligned(16); +} __packed __aligned(64); #define ZPCI_MSI_VEC_BITS 11 #define ZPCI_MSI_VEC_MAX (1 << ZPCI_MSI_VEC_BITS) --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -840,8 +840,11 @@ static inline int barsize(u8 size) static int zpci_mem_init(void) { + BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) || + __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb)); + zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), - 16, 0, NULL); + __alignof__(struct zpci_fmb), 0, NULL); if (!zdev_fmb_cache) goto error_zdev;