[PATCH] RMDA/siw: Require a 64 bit arch

[Jason Gunthorpe]

The new siw driver fails to build on i386 with

drivers/infiniband/sw/siw/siw_qp.c:1025:3: error: invalid output size for constraint '+q'
                smp_store_mb(*cq->notify, SIW_NOTIFY_NOT);

As it is using 64 bit values with the smp_store_mb.

Since the entire scheme here seems questionable, and we are in the merge
window, fix the compile failures by disabling 32 bit support on this
driver.

A proper fix will be reviewed post merge window.

Fixes: c0cf5bdde46c ("rdma/siw: addition to kernel build environment")
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
 drivers/infiniband/sw/siw/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/siw/Kconfig b/drivers/infiniband/sw/siw/Kconfig
index b622fc62f2cd6d..dace276aea1413 100644
--- a/drivers/infiniband/sw/siw/Kconfig
+++ b/drivers/infiniband/sw/siw/Kconfig
@@ -1,6 +1,6 @@
 config RDMA_SIW
 	tristate "Software RDMA over TCP/IP (iWARP) driver"
-	depends on INET && INFINIBAND && LIBCRC32C
+	depends on INET && INFINIBAND && LIBCRC32C && 64BIT
 	select DMA_VIRT_OPS
 	help
 	This driver implements the iWARP RDMA transport over
-- 
2.21.0