From c1948606af0861bd181cb85ed1797ef02c20bbec Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Mon, 14 Mar 2016 15:47:23 +0100 Subject: s390/pci: enforce fmb page boundary rule 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 Signed-off-by: Greg Kroah-Hartman --- arch/s390/include/asm/pci.h | 2 +- arch/s390/pci/pci.c | 5 ++++- 2 files changed, 5 insertions(+), 2 deletions(-) (limited to 'arch') diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index c873e682b67f..2b2ced9dc00a 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -45,7 +45,7 @@ struct zpci_fmb { u64 rpcit_ops; u64 dma_rbytes; u64 dma_wbytes; -} __packed __aligned(16); +} __packed __aligned(64); enum zpci_state { ZPCI_FN_STATE_RESERVED, diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index 7ef12a3ace3a..19442395f413 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -871,8 +871,11 @@ 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; -- cgit v1.2.3