We get a build failure on ARM unless the header is included explicitly:

drivers/infiniband/hw/i40iw/i40iw_verbs.c: In function 
'i40iw_get_vector_affinity':
drivers/infiniband/hw/i40iw/i40iw_verbs.c:2747:9: error: implicit declaration 
of function 'irq_get_affinity_mask'; did you mean 'irq_create_affinity_masks'? 
[-Werror=implicit-function-declaration]
  return irq_get_affinity_mask(msix_vec->irq);
         ^~~~~~~~~~~~~~~~~~~~~
         irq_create_affinity_masks
drivers/infiniband/hw/i40iw/i40iw_verbs.c:2747:9: error: returning 'int' from a 
function with return type 'const struct cpumask *' makes pointer from integer 
without a cast [-Werror=int-conversion]
  return irq_get_affinity_mask(msix_vec->irq);

Fixes: 7e952b19eb63 ("i40iw: Implement get_vector_affinity API")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/infiniband/hw/i40iw/i40iw_verbs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c 
b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
index a51798578f27..f3af952402e9 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -38,6 +38,7 @@
 #include <linux/highmem.h>
 #include <linux/time.h>
 #include <linux/hugetlb.h>
+#include <linux/irq.h>
 #include <asm/byteorder.h>
 #include <net/ip.h>
 #include <rdma/ib_verbs.h>
-- 
2.9.0

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