--- /dev/null
+From da360299b6734135a5f66d7db458dcc7801c826a Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Mon, 12 Feb 2018 23:59:51 +0100
+Subject: uapi/if_ether.h: move __UAPI_DEF_ETHHDR libc define
+
+From: Hauke Mehrtens <hauke@hauke-m.de>
+
+commit da360299b6734135a5f66d7db458dcc7801c826a upstream.
+
+This fixes a compile problem of some user space applications by not
+including linux/libc-compat.h in uapi/if_ether.h.
+
+linux/libc-compat.h checks which "features" the header files, included
+from the libc, provide to make the Linux kernel uapi header files only
+provide no conflicting structures and enums. If a user application mixes
+kernel headers and libc headers it could happen that linux/libc-compat.h
+gets included too early where not all other libc headers are included
+yet. Then the linux/libc-compat.h would not prevent all the
+redefinitions and we run into compile problems.
+This patch removes the include of linux/libc-compat.h from
+uapi/if_ether.h to fix the recently introduced case, but not all as this
+is more or less impossible.
+
+It is no problem to do the check directly in the if_ether.h file and not
+in libc-compat.h as this does not need any fancy glibc header detection
+as glibc never provided struct ethhdr and should define
+__UAPI_DEF_ETHHDR by them self when they will provide this.
+
+The following test program did not compile correctly any more:
+
+#include <linux/if_ether.h>
+#include <netinet/in.h>
+#include <linux/in.h>
+
+int main(void)
+{
+ return 0;
+}
+
+Fixes: 6926e041a892 ("uapi/if_ether.h: prevent redefinition of struct ethhdr")
+Reported-by: Guillaume Nault <g.nault@alphalink.fr>
+Cc: <stable@vger.kernel.org> # 4.15
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ include/uapi/linux/if_ether.h | 6 +++++-
+ include/uapi/linux/libc-compat.h | 6 ------
+ 2 files changed, 5 insertions(+), 7 deletions(-)
+
+--- a/include/uapi/linux/if_ether.h
++++ b/include/uapi/linux/if_ether.h
+@@ -23,7 +23,6 @@
+ #define _UAPI_LINUX_IF_ETHER_H
+
+ #include <linux/types.h>
+-#include <linux/libc-compat.h>
+
+ /*
+ * IEEE 802.3 Ethernet magic constants. The frame sizes omit the preamble
+@@ -151,6 +150,11 @@
+ * This is an Ethernet frame header.
+ */
+
++/* allow libcs like musl to deactivate this, glibc does not implement this. */
++#ifndef __UAPI_DEF_ETHHDR
++#define __UAPI_DEF_ETHHDR 1
++#endif
++
+ #if __UAPI_DEF_ETHHDR
+ struct ethhdr {
+ unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
+--- a/include/uapi/linux/libc-compat.h
++++ b/include/uapi/linux/libc-compat.h
+@@ -264,10 +264,4 @@
+
+ #endif /* __GLIBC__ */
+
+-/* Definitions for if_ether.h */
+-/* allow libcs like musl to deactivate this, glibc does not implement this. */
+-#ifndef __UAPI_DEF_ETHHDR
+-#define __UAPI_DEF_ETHHDR 1
+-#endif
+-
+ #endif /* _UAPI_LIBC_COMPAT_H */