[PATCH iproute2 v2 2/2] devlink: fix libc and kernel headers collision

[Baruch Siach]

Since commit 2f1242efe9d ("devlink: Add devlink health show command") we
use the sys/sysinfo.h header for the sysinfo(2) system call. But since
iproute2 carries a local version of the kernel struct sysinfo, this
causes a collision with libc that do not rely on kernel defined sysinfo
like musl libc:

In file included from devlink.c:25:0:
.../sysroot/usr/include/sys/sysinfo.h:10:8: error: redefinition of 'struct 
sysinfo'
 struct sysinfo {
        ^~~~~~~
In file included from ../include/uapi/linux/kernel.h:5:0,
                 from ../include/uapi/linux/netlink.h:5,
                 from ../include/uapi/linux/genetlink.h:6,
                 from devlink.c:21:
../include/uapi/linux/sysinfo.h:8:8: note: originally defined here
 struct sysinfo {
        ^~~~~~~

Move the sys/sysinfo.h userspace header before kernel headers, and
suppress the indirect include of linux/sysinfo.h.

Cc: Aya Levin <a...@mellanox.com>
Cc: Moshe Shemesh <mo...@mellanox.com>
Signed-off-by: Baruch Siach <bar...@tkos.co.il>
---
v2: Shorten comment
---
 devlink/devlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index b6e68f9a4d65..039225df7cbf 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -18,11 +18,12 @@
 #include <limits.h>
 #include <errno.h>
 #include <inttypes.h>
+#include <sys/sysinfo.h>
+#define _LINUX_SYSINFO_H /* avoid collision with musl header */
 #include <linux/genetlink.h>
 #include <linux/devlink.h>
 #include <libmnl/libmnl.h>
 #include <netinet/ether.h>
-#include <sys/sysinfo.h>
 #include <sys/queue.h>
 
 #include "SNAPSHOT.h"
-- 
2.20.1