netdev - [PATCH bpf] samples: bpf: fix build error

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Message-Id: <20200511113234.80722-1-mcroce@redhat.com>
Date:   Mon, 11 May 2020 13:32:34 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Joe Stringer <joe@....org>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH bpf] samples: bpf: fix build error

GCC 10 is very strict about symbol clash, and lwt_len_hist_user contains
a symbol which clashes with libbpf:

/usr/bin/ld: samples/bpf/lwt_len_hist_user.o:(.bss+0x0): multiple definition of `bpf_log_buf'; samples/bpf/bpf_load.o:(.bss+0x8c0): first defined here
collect2: error: ld returned 1 exit status

bpf_log_buf here seems to be a leftover, so removing it.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 samples/bpf/lwt_len_hist_user.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
index 587b68b1f8dd..430a4b7e353e 100644
--- a/samples/bpf/lwt_len_hist_user.c
+++ b/samples/bpf/lwt_len_hist_user.c
@@ -15,8 +15,6 @@
 #define MAX_INDEX 64
 #define MAX_STARS 38
 
-char bpf_log_buf[BPF_LOG_BUF_SIZE];
-
 static void stars(char *str, long val, long max, int width)
 {
 	int i;
-- 
2.26.2