From: Arnaldo Carvalho de Melo Date: Tue, 31 Jul 2018 14:58:57 +0000 (-0300) Subject: perf bpf: Show better message when failing to load an object X-Git-Tag: v4.19~478^2^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=739e2edc848af30fefa66d6c422c00ca9a701c06;p=platform%2Fkernel%2Flinux-rpi.git perf bpf: Show better message when failing to load an object Before: libbpf: license of tools/perf/examples/bpf/etcsnoop.c is GPL libbpf: section(6) version, size 4, link 0, flags 3, type=1 libbpf: kernel version of tools/perf/examples/bpf/etcsnoop.c is 41200 libbpf: section(7) .symtab, size 120, link 1, flags 0, type=2 bpf: config program 'syscalls:sys_enter_openat' libbpf: load bpf program failed: Operation not permitted libbpf: failed to load program 'syscalls:sys_enter_openat' libbpf: failed to load object 'tools/perf/examples/bpf/etcsnoop.c' bpf: load objects failed After: (just the last line changes) bpf: load objects failed: err=-4009: (Incorrect kernel version) Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-wi44iid0yjfht3lcvplc75fm@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c index cee6587..3d02ae3 100644 --- a/tools/perf/util/bpf-loader.c +++ b/tools/perf/util/bpf-loader.c @@ -747,7 +747,9 @@ int bpf__load(struct bpf_object *obj) err = bpf_object__load(obj); if (err) { - pr_debug("bpf: load objects failed\n"); + char bf[128]; + libbpf_strerror(err, bf, sizeof(bf)); + pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf); return err; } return 0;