target/linux/generic/backport-4.9/272-uapi-if_ether.h-prevent-redefinition-of-struct-ethhd.patch

   1 From 649affd04813c43e0a72886517fcfccd63230981 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Mon, 29 Jun 2015 16:53:03 +0200
   4 Subject: uapi/if_ether.h: prevent redefinition of struct ethhdr
   5
   6 Musl provides its own ethhdr struct definition. Add a guard to prevent
   7 its definition of the appropriate musl header has already been included.
   8
   9 glibc does not implement this header, but when glibc will implement this
  10 they can just define __UAPI_DEF_ETHHDR 0 to make it work with the
  11 kernel.
  12
  13 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  14 ---
  15  include/uapi/linux/if_ether.h    | 3 +++
  16  include/uapi/linux/libc-compat.h | 6 ++++++
  17  2 files changed, 9 insertions(+)
  18
  19 --- a/include/uapi/linux/if_ether.h
  20 +++ b/include/uapi/linux/if_ether.h
  21 @@ -22,6 +22,7 @@
  22  #define _UAPI_LINUX_IF_ETHER_H
  23
  24  #include <linux/types.h>
  25 +#include <linux/libc-compat.h>
  26
  27  /*
  28   *     IEEE 802.3 Ethernet magic constants.  The frame sizes omit the preamble
  29 @@ -139,11 +140,13 @@
  30   *     This is an Ethernet frame header.
  31   */
  32
  33 +#if __UAPI_DEF_ETHHDR
  34  struct ethhdr {
  35         unsigned char   h_dest[ETH_ALEN];       /* destination eth addr */
  36         unsigned char   h_source[ETH_ALEN];     /* source ether addr    */
  37         __be16          h_proto;                /* packet type ID field */
  38  } __attribute__((packed));
  39 +#endif
  40
  41
  42  #endif /* _UAPI_LINUX_IF_ETHER_H */
  43 --- a/include/uapi/linux/libc-compat.h
  44 +++ b/include/uapi/linux/libc-compat.h
  45 @@ -263,4 +263,10 @@
  46
  47  #endif /* __GLIBC__ */
  48
  49 +/* Definitions for if_ether.h */
  50 +/* allow libcs like musl to deactivate this, glibc does not implement this. */
  51 +#ifndef __UAPI_DEF_ETHHDR
  52 +#define __UAPI_DEF_ETHHDR              1
  53 +#endif
  54 +
  55  #endif /* _UAPI_LIBC_COMPAT_H */