vmxnet3: prevent building with 64K pages

commit fbdf0e28d061708cf18ba0f8e0db5360dc9a15b9 upstream.

I got a warning about broken code on ARM64 with 64K pages:

drivers/net/vmxnet3/vmxnet3_drv.c: In function 'vmxnet3_rq_init':
drivers/net/vmxnet3/vmxnet3_drv.c:1679:29: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
    rq->buf_info[0][i].len = PAGE_SIZE;

'len' here is a 16-bit integer, so this clearly won't work. I don't think
this driver is used much on anything other than x86, so there is no need
to fix this properly and we can work around it with a Kconfig dependency
to forbid known-broken configurations. qemu in theory supports it on
other architectures too, but presumably only for compatibility with x86
guests that also run on vmware.

CONFIG_PAGE_SIZE_64KB is used on hexagon, mips, sh and tile, the other
symbols are architecture-specific names for the same thing.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f184fb5..5116aec 100644 (file)
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -411,6 +411,9 @@ config XEN_NETDEV_BACKEND
 config VMXNET3
        tristate "VMware VMXNET3 ethernet driver"
        depends on PCI && INET
+       depends on !(PAGE_SIZE_64KB || ARM64_64K_PAGES || \
+                    IA64_PAGE_SIZE_64KB || MICROBLAZE_64K_PAGES || \
+                    PARISC_PAGE_SIZE_64KB || PPC_64K_PAGES)
        help
          This driver supports VMware's vmxnet3 virtual ethernet NIC.
          To compile this driver as a module, choose M here: the