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authorYonghong Song <yhs@fb.com>2019-02-28 22:19:41 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2019-03-02 01:07:10 +0100
commitb74e21ab7d438117a10d2d331bdfc275fcab2970 (patch)
tree3711300819df6b134db06ee554bbedc60242dd85 /samples
parenta83de90658280611933d6b3e5044726f63a953f2 (diff)
downloadlinux-stericsson-b74e21ab7d438117a10d2d331bdfc275fcab2970.tar.gz
samples/bpf: silence compiler warning for xdpsock_user.c
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 <yhs@fb.com> Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/xdpsock_user.c6
1 files 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 (;;) {