From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- samples/bpf/sockex2_user.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 samples/bpf/sockex2_user.c (limited to 'samples/bpf/sockex2_user.c') diff --git a/samples/bpf/sockex2_user.c b/samples/bpf/sockex2_user.c new file mode 100644 index 000000000..2c1847133 --- /dev/null +++ b/samples/bpf/sockex2_user.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include "sock_example.h" +#include +#include + +struct pair { + __u64 packets; + __u64 bytes; +}; + +int main(int ac, char **argv) +{ + struct bpf_program *prog; + struct bpf_object *obj; + int map_fd, prog_fd; + char filename[256]; + int i, sock, err; + FILE *f; + + snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); + obj = bpf_object__open_file(filename, NULL); + if (libbpf_get_error(obj)) + return 1; + + prog = bpf_object__next_program(obj, NULL); + bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER); + + err = bpf_object__load(obj); + if (err) + return 1; + + prog_fd = bpf_program__fd(prog); + map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); + + sock = open_raw_sock("lo"); + + assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, + sizeof(prog_fd)) == 0); + + f = popen("ping -4 -c5 localhost", "r"); + (void) f; + + for (i = 0; i < 5; i++) { + int key = 0, next_key; + struct pair value; + + while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) { + bpf_map_lookup_elem(map_fd, &next_key, &value); + printf("ip %s bytes %lld packets %lld\n", + inet_ntoa((struct in_addr){htonl(next_key)}), + value.bytes, value.packets); + key = next_key; + } + sleep(1); + } + return 0; +} -- cgit v1.3.1