uapi: define DIV_ROUND_UP for userland

DIV_ROUND_UP is defined in linux/kernel.h only for the kernel.
When ethtool.h is included by a userland app, we got the following error:

include/linux/ethtool.h:1218:8: error: variably modified 'queue_mask' at file scope
  __u32 queue_mask[DIV_ROUND_UP(MAX_NUM_QUEUE, 32)];
        ^

Let's add a common definition in uapi and use it everywhere.

Fixes: ac2c7ad0e5d6 ("net/ethtool: introduce a new ioctl for per queue setting")
CC: Kan Liang <kan.liang@intel.com>
Suggested-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 5 insertions, 8 deletions

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 37fd6dc33de4..9c22249ebf35 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -13,6 +13,7 @@
 #ifndef _UAPI_LINUX_ETHTOOL_H
 #define _UAPI_LINUX_ETHTOOL_H
 
+#include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/if_ether.h>
 
@@ -1215,7 +1216,7 @@ enum ethtool_sfeatures_retval_bits {
 struct ethtool_per_queue_op {
         __u32   cmd;
         __u32   sub_command;
-        __u32   queue_mask[DIV_ROUND_UP(MAX_NUM_QUEUE, 32)];
+        __u32   queue_mask[__KERNEL_DIV_ROUND_UP(MAX_NUM_QUEUE, 32)];
         char    data[];
 };
 
diff --git a/include/uapi/linux/kernel.h b/include/uapi/linux/kernel.h
index 321e399457f5..466073f0ce46 100644
--- a/include/uapi/linux/kernel.h
+++ b/include/uapi/linux/kernel.h
@@ -9,5 +9,6 @@
 #define __ALIGN_KERNEL(x, a)            __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
 #define __ALIGN_KERNEL_MASK(x, mask)    (((x) + (mask)) & ~(mask))
 
+#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
 
 #endif /* _UAPI_LINUX_KERNEL_H */
diff --git a/include/uapi/linux/mroute6.h b/include/uapi/linux/mroute6.h
index ce91215cf7e6..5062fb5751e1 100644
--- a/include/uapi/linux/mroute6.h
+++ b/include/uapi/linux/mroute6.h
@@ -1,6 +1,7 @@
 #ifndef _UAPI__LINUX_MROUTE6_H
 #define _UAPI__LINUX_MROUTE6_H
 
+#include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/sockios.h>
 
@@ -46,14 +47,8 @@ typedef unsigned short mifi_t;
 typedef __u32           if_mask;
 #define NIFBITS (sizeof(if_mask) * 8)        /* bits per mask */
 
-#if !defined(__KERNEL__)
-#if !defined(DIV_ROUND_UP)
-#define DIV_ROUND_UP(x,y)       (((x) + ((y) - 1)) / (y))
-#endif
-#endif
-
 typedef struct if_set {
-        if_mask ifs_bits[DIV_ROUND_UP(IF_SETSIZE, NIFBITS)];
+        if_mask ifs_bits[__KERNEL_DIV_ROUND_UP(IF_SETSIZE, NIFBITS)];
 } if_set;
 
 #define IF_SET(n, p)    ((p)->ifs_bits[(n)/NIFBITS] |= (1 << ((n) % NIFBITS)))