linux-kernel - [PATCH 5.4 52/62] bpftool: Fix compilation failure for net.o with older glibc

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Message-Id: <20210115122000.903449640@linuxfoundation.org>
Date:   Fri, 15 Jan 2021 13:28:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alan Maguire <alan.maguire@...cle.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>
Subject: [PATCH 5.4 52/62] bpftool: Fix compilation failure for net.o with older glibc

From: Alan Maguire <alan.maguire@...cle.com>

commit 6f02b540d7597f357bc6ee711346761045d4e108 upstream.

For older glibc ~2.17, #include'ing both linux/if.h and net/if.h
fails due to complaints about redefinition of interface flags:

  CC       net.o
In file included from net.c:13:0:
/usr/include/linux/if.h:71:2: error: redeclaration of enumerator ‘IFF_UP’
  IFF_UP    = 1<<0,  /* sysfs */
  ^
/usr/include/net/if.h:44:5: note: previous definition of ‘IFF_UP’ was here
     IFF_UP = 0x1,  /* Interface is up.  */

The issue was fixed in kernel headers in [1], but since compilation
of net.c picks up system headers the problem can recur.

Dropping #include <linux/if.h> resolves the issue and it is
not needed for compilation anyhow.

[1] https://lore.kernel.org/netdev/1461512707-23058-1-git-send-email-mikko.rapeli__34748.27880641$1462831734$gmane$org@iki.fi/

Fixes: f6f3bac08ff9 ("tools/bpf: bpftool: add net support")
Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Acked-by: Martin KaFai Lau <kafai@...com>
Link: https://lore.kernel.org/bpf/1609948746-15369-1-git-send-email-alan.maguire@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/bpf/bpftool/net.c |    1 -
 1 file changed, 1 deletion(-)

--- a/tools/bpf/bpftool/net.c
+++ b/tools/bpf/bpftool/net.c
@@ -9,7 +9,6 @@
 #include <unistd.h>
 #include <libbpf.h>
 #include <net/if.h>
-#include <linux/if.h>
 #include <linux/rtnetlink.h>
 #include <linux/tc_act/tc_bpf.h>
 #include <sys/socket.h>