Commit-ID: 811b4f0d785d33eabfff5d0ea60596b6b8bdc825
Gitweb: http://git.kernel.org/tip/811b4f0d785d33eabfff5d0ea60596b6b8bdc825
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 20 Dec 2016 11:03:13 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 20 Dec 2016 12:00:39 -0300
samples/bpf: Be consistent with bpf_load_program bpf_insn parameter
Only one of the examples declare the bpf_insn bpf proggie as a const:
$ grep 'struct bpf_insn [a-z]' samples/bpf/*.c
samples/bpf/fds_example.c: static const struct bpf_insn insns[] = {
samples/bpf/sock_example.c: struct bpf_insn prog[] = {
samples/bpf/test_cgrp2_attach2.c: struct bpf_insn prog[] = {
samples/bpf/test_cgrp2_attach.c: struct bpf_insn prog[] = {
samples/bpf/test_cgrp2_sock.c: struct bpf_insn prog[] = {
$
Which causes this warning:
[root@f5065a7d6272 linux]# make -j4 O=/tmp/build/linux samples/bpf/
<SNIP>
HOSTCC samples/bpf/fds_example.o
/git/linux/samples/bpf/fds_example.c: In function 'bpf_prog_create':
/git/linux/samples/bpf/fds_example.c:63:6: warning: passing argument 2 of 'bpf_load_program' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
insns, insns_cnt, "GPL", 0,
^~~~~
In file included from /git/linux/samples/bpf/libbpf.h:5:0,
from /git/linux/samples/bpf/bpf_load.h:4,
from /git/linux/samples/bpf/fds_example.c:15:
/git/linux/tools/lib/bpf/bpf.h:31:5: note: expected 'struct bpf_insn *' but argument is of type 'const struct bpf_insn *'
int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
^~~~~~~~~~~~~~~~
HOSTCC samples/bpf/sockex1_user.o
So just ditch that 'const' to reduce build noise, leaving changing the
bpf_load_program() bpf_insn parameter to const to a later patch, if deemed
adequate.
Cc: Joe Stringer <joe@xxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-1z5xee8n3oa66jf62bpv16ed@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
samples/bpf/fds_example.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/samples/bpf/fds_example.c b/samples/bpf/fds_example.c
index 6245062..a5cddc9 100644
--- a/samples/bpf/fds_example.c
+++ b/samples/bpf/fds_example.c
@@ -49,7 +49,7 @@ static int bpf_map_create(void)
static int bpf_prog_create(const char *object)
{
- static const struct bpf_insn insns[] = {
+ static struct bpf_insn insns[] = {
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
};
--
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