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uapi: define DIV_ROUND_UP for userland

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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: ac2c7ad0e5 ("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>
This commit is contained in:
Nicolas Dichtel 2016-03-04 11:52:16 +01:00 committed by David S. Miller
parent 9b2f8f616a
commit b5d3755a22
4 changed files with 6 additions and 9 deletions
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2
include/linux/kernel.h
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@ -64,7 +64,7 @@
#define round_down(x, y) ((x) & ~__round_mask(x, y))
#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP
#define DIV_ROUND_UP_ULL(ll,d) \
({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })

3
include/uapi/linux/ethtool.h
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@ -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[];
};

1
include/uapi/linux/kernel.h
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@ -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 */

9
include/uapi/linux/mroute6.h
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@ -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)))