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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-03-14 15:47:23 +0100 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-04-18 08:49:30 -0400 |
| commit | cc1f245678051ff224e9aca9502ae430a8bdf5d9 (patch) | |
| tree | 0154c997f77a082274176ed4852549c87fc7fda2 | |
| parent | f0ed9d88d009fdaf30fe93c366c1f1f87df73a19 (diff) | |
| download | lwn-cc1f245678051ff224e9aca9502ae430a8bdf5d9.tar.gz lwn-cc1f245678051ff224e9aca9502ae430a8bdf5d9.zip | |
s390/pci: enforce fmb page boundary rule
[ Upstream commit 80c544ded25ac14d7cc3e555abb8ed2c2da99b84 ]
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")
Cc: stable@vger.kernel.org # v3.8+
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | arch/s390/include/asm/pci.h | 2 | ||||
| -rw-r--r-- | arch/s390/pci/pci.c | 5 |
2 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index 7672152a93ac..d2d23f88464f 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -44,7 +44,7 @@ struct zpci_fmb { u64 rpcit_ops; u64 dma_rbytes; u64 dma_wbytes; -} __packed __aligned(16); +} __packed __aligned(64); #define ZPCI_MSI_VEC_BITS 11 #define ZPCI_MSI_VEC_MAX (1 << ZPCI_MSI_VEC_BITS) diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index 1902ce7cb71d..944818617718 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -845,8 +845,11 @@ 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; |