3.16.35-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Sebastian Ott <seb...@linux.vnet.ibm.com>
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 <seb...@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
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;
