/home/darkstar/net/samples/bpf/trace_output_user.c:64:6: warning: no previous prototype for ‘perf_event_read’ [-Wmissing-prototypes]
 void perf_event_read(print_fn fn)
      ^
In file included from /home/darkstar/net/samples/bpf/sockex2_kern.c:8:
In file included from ./include/uapi/linux/if_tunnel.h:6:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/sockex2_kern.c:8:
In file included from ./include/uapi/linux/if_tunnel.h:6:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/sockex3_kern.c:14:
In file included from ./include/uapi/linux/if_tunnel.h:6:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/sockex3_kern.c:14:
In file included from ./include/uapi/linux/if_tunnel.h:6:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/tracex1_kern.c:7:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/tracex1_kern.c:7:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/tracex2_kern.c:7:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/tracex2_kern.c:7:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/tracex3_kern.c:7:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/tracex3_kern.c:7:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/tracex4_kern.c:7:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/tracex5_kern.c:7:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/tracex6_kern.c:1:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/test_probe_write_user_kern.c:7:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/test_probe_write_user_kern.c:7:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/trace_output_kern.c:1:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/tcbpf2_kern.c:18:
In file included from ./include/net/ipv6.h:16:
In file included from ./include/linux/ipv6.h:76:
In file included from ./include/linux/icmpv6.h:4:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/tcbpf2_kern.c:18:
In file included from ./include/net/ipv6.h:16:
In file included from ./include/linux/ipv6.h:76:
In file included from ./include/linux/icmpv6.h:4:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/lathist_kern.c:9:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/offwaketime_kern.c:12:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/spintest_kern.c:7:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/spintest_kern.c:7:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/map_perf_test_kern.c:7:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/map_perf_test_kern.c:7:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/test_overhead_kprobe_kern.c:8:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/parse_varlen.c:8:
In file included from ./include/linux/if_ether.h:23:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/parse_varlen.c:8:
In file included from ./include/linux/if_ether.h:23:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/parse_simple.c:8:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/parse_simple.c:8:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/parse_ldabs.c:8:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/parse_ldabs.c:8:
In file included from ./include/linux/ip.h:20:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/xdp1_kern.c:10:
In file included from ./include/linux/if_ether.h:23:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/xdp1_kern.c:10:
In file included from ./include/linux/if_ether.h:23:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/xdp2_kern.c:10:
In file included from ./include/linux/if_ether.h:23:
In file included from ./include/linux/skbuff.h:29:
In file included from ./include/linux/net.h:28:
./include/linux/fs.h:2693:9: warning: comparison of unsigned enum expression < 0 is always false [-Wtautological-compare]
        if (id < 0 || id >= READING_MAX_ID)
            ~~ ^ ~
In file included from /home/darkstar/net/samples/bpf/xdp2_kern.c:10:
In file included from ./include/linux/if_ether.h:23:
In file included from ./include/linux/skbuff.h:30:
In file included from ./include/linux/textsearch.h:8:
In file included from ./include/linux/slab.h:118:
In file included from ./include/linux/kasan.h:4:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
2 warnings generated.
In file included from /home/darkstar/net/samples/bpf/test_current_task_under_cgroup_kern.c:8:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/trace_event_kern.c:7:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.
In file included from /home/darkstar/net/samples/bpf/sampleip_kern.c:8:
In file included from ./include/linux/ptrace.h:5:
In file included from ./include/linux/sched.h:61:
./include/linux/cgroup-defs.h:322:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end]
        struct cgroup cgrp;
                      ^
1 warning generated.