[PATCH bpf-next] samples/bpf: silence compiler warning for xdpsock_user.c

[Yonghong Song]

Compiling xdpsock_user.c with 4.8.5, I hit the following
compilation warning:
    HOSTCC  samples/bpf/xdpsock_user.o
  /data/users/yhs/work/net-next/samples/bpf/xdpsock_user.c: In function ‘main’:
  /data/users/yhs/work/net-next/samples/bpf/xdpsock_user.c:449:6: warning: 
‘idx_cq’ may be used unini
  tialized in this function [-Wmaybe-uninitialized]
    u32 idx_cq, idx_fq;
        ^
  /data/users/yhs/work/net-next/samples/bpf/xdpsock_user.c:606:7: warning: 
‘idx_rx’ may be used unini
  tialized in this function [-Wmaybe-uninitialized]
     u32 idx_rx, idx_tx = 0;
         ^
  /data/users/yhs/work/net-next/samples/bpf/xdpsock_user.c:506:6: warning: 
‘idx_rx’ may be used unini
  tialized in this function [-Wmaybe-uninitialized]
    u32 idx_rx, idx_fq = 0;

As an example, the code pattern looks like:
    u32 idx_cq;
    ...
    ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
    if (ret) {
      ...
    }
    ... idx_fq ...
The compiler warns since it does not know whether &idx_fq is assigned
or not inside the library function xsk_ring_prod__reserve().

Let us assign an initial value 0 to such auto variables to silence
compiler warning.

Fixes: 248c7f9c0e21 ("samples/bpf: convert xdpsock to use libbpf for AF_XDP 
access")
Signed-off-by: Yonghong Song <y...@fb.com>
---
 samples/bpf/xdpsock_user.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 9c76d6d43deb..d08ee1ab7bb4 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -446,7 +446,7 @@ static void kick_tx(struct xsk_socket_info *xsk)
 
 static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
 {
-       u32 idx_cq, idx_fq;
+       u32 idx_cq = 0, idx_fq = 0;
        unsigned int rcvd;
        size_t ndescs;
 
@@ -503,7 +503,7 @@ static inline void complete_tx_only(struct xsk_socket_info 
*xsk)
 static void rx_drop(struct xsk_socket_info *xsk)
 {
        unsigned int rcvd, i;
-       u32 idx_rx, idx_fq = 0;
+       u32 idx_rx = 0, idx_fq = 0;
        int ret;
 
        rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
@@ -603,7 +603,7 @@ static void l2fwd(struct xsk_socket_info *xsk)
 {
        for (;;) {
                unsigned int rcvd, i;
-               u32 idx_rx, idx_tx = 0;
+               u32 idx_rx = 0, idx_tx = 0;
                int ret;
 
                for (;;) {
-- 
2.17.1