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authorDaniel Borkmann <daniel@iogearbox.net>2017-05-02 00:47:09 +0200
committerDavid S. Miller <davem@davemloft.net>2017-05-02 15:29:35 +0200
commiteb6211d3606971a957fea28f7532687f9d0f93f2 (patch)
tree5c59af3a6e75f1882b3e52e793ff147b942fdc0f /samples/bpf
parentsparc64: Fix BPF JIT wrt. branches and ldimm64 instructions. (diff)
downloadlinux-eb6211d3606971a957fea28f7532687f9d0f93f2.tar.xz
linux-eb6211d3606971a957fea28f7532687f9d0f93f2.zip
bpf, samples: fix build warning in cookie_uid_helper_example
Fix the following warnings triggered by 51570a5ab2b7 ("A Sample of using socket cookie and uid for traffic monitoring"): In file included from /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:54:0: /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c: In function 'prog_load': /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:119:27: warning: overflow in implicit constant conversion [-Woverflow] -32 + offsetof(struct stats, uid)), ^ /home/foo/net-next/samples/bpf/libbpf.h:135:12: note: in definition of macro 'BPF_STX_MEM' .off = OFF, \ ^ /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:121:27: warning: overflow in implicit constant conversion [-Woverflow] -32 + offsetof(struct stats, packets), 1), ^ /home/foo/net-next/samples/bpf/libbpf.h:155:12: note: in definition of macro 'BPF_ST_MEM' .off = OFF, \ ^ /home/foo/net-next/samples/bpf/cookie_uid_helper_example.c:129:27: warning: overflow in implicit constant conversion [-Woverflow] -32 + offsetof(struct stats, bytes)), ^ /home/foo/net-next/samples/bpf/libbpf.h:135:12: note: in definition of macro 'BPF_STX_MEM' .off = OFF, \ ^ HOSTLD /home/foo/net-next/samples/bpf/per_socket_stats_example Fixes: 51570a5ab2b7 ("A Sample of using socket cookie and uid for traffic monitoring") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/cookie_uid_helper_example.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/samples/bpf/cookie_uid_helper_example.c b/samples/bpf/cookie_uid_helper_example.c
index 9ce55840d61d..b08ab4e88929 100644
--- a/samples/bpf/cookie_uid_helper_example.c
+++ b/samples/bpf/cookie_uid_helper_example.c
@@ -116,9 +116,9 @@ static void prog_load(void)
* is set by directly place a IMM value 1 into the stack.
*/
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0,
- -32 + offsetof(struct stats, uid)),
+ -32 + (__s16)offsetof(struct stats, uid)),
BPF_ST_MEM(BPF_DW, BPF_REG_10,
- -32 + offsetof(struct stats, packets), 1),
+ -32 + (__s16)offsetof(struct stats, packets), 1),
/*
* __sk_buff is a special struct used for eBPF program to
* directly access some sk_buff field.
@@ -126,7 +126,7 @@ static void prog_load(void)
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6,
offsetof(struct __sk_buff, len)),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1,
- -32 + offsetof(struct stats, bytes)),
+ -32 + (__s16)offsetof(struct stats, bytes)),
/*
* add new map entry using BPF_FUNC_map_update_elem, it takes
* 4 parameters (R1: map_fd, R2: &socket_cookie, R3: &stats,