On Wed, 27 Apr 2016, Ben Hutchings wrote:
> 3.16.35-rc1 review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
>
> 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 <sebott@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
> [bwh: Backported to 3.16: adjust context]
> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
The BUILD_BUG_ON below will be triggered. This patch has a
dependency on commit:
6001018ae "s390/pci: extract software counters from fmb"
could you please fetch that one too?
Thanks,
Sebastian
> ---
> 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;
>
>
>
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