On 2015/6/24 20:31, Wang Nan wrote: [SNIP]
diff --git a/tools/perf/util/bpf-prologue.h b/tools/perf/util/bpf-prologue.h new file mode 100644 index 0000000..3f77606 --- /dev/null +++ b/tools/perf/util/bpf-prologue.h @@ -0,0 +1,19 @@ +/* + * Copyright (C) 2015, He Kuang <[email protected]> + * Copyright (C) 2015, Huawei Inc. + */ +#ifndef __BPF_PROLOGUE_H +#define __BPF_PROLOGUE_H + +#include <linux/filter.h> +#include "probe-event.h" + +#define BPF_PROLOGUE_MAX_ARGS 3 +#define BPF_PROLOGUE_START_ARG_REG BPF_REG_3 +#define BPF_PROLOGUE_FETCH_RESULT_REG BPF_REG_2 + +int bpf__gen_prologue(struct probe_trace_arg *args, int nargs, + struct bpf_insn *new_prog, size_t *new_cnt, + size_t cnt_space); +
Here is a problem: if CONFIG_BPF_PROLOGUE is not set, a missing symbol problem will be triggered. I have updated this part in my patchset: +/* + * Copyright (C) 2015, He Kuang <[email protected]> + * Copyright (C) 2015, Huawei Inc. + */ +#ifndef __BPF_PROLOGUE_H +#define __BPF_PROLOGUE_H + +#include <linux/compiler.h> +#include <linux/filter.h> +#include "probe-event.h" + +#define BPF_PROLOGUE_MAX_ARGS 3 +#define BPF_PROLOGUE_START_ARG_REG BPF_REG_3 +#define BPF_PROLOGUE_FETCH_RESULT_REG BPF_REG_2 + +#ifdef HAVE_BPF_PROLOGUE +int bpf__gen_prologue(struct probe_trace_arg *args, int nargs, + struct bpf_insn *new_prog, size_t *new_cnt, + size_t cnt_space); +#else +static inline int +bpf__gen_prologue(struct probe_trace_arg *args __maybe_unused, + int nargs __maybe_unused, + struct bpf_insn *new_prog __maybe_unused, + size_t *new_cnt, + size_t cnt_space __maybe_unused) +{ + if (!new_cnt) + return -EINVAL; + *new_cnt = 0; + return 0; +} +#endif +#endif /* __BPF_PROLOGUE_H */
+#endif /* __BPF_PROLOGUE_H */
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