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| author | Jiri Olsa <jolsa@kernel.org> | 2022-10-25 16:41:42 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-10-25 20:14:50 +0300 |
| commit | 3640bf8584f4ab0f5eed6285f09213954acd8b62 (patch) | |
| tree | 10c32c12bd3d71373bfe308f5cafa059b858f15b /kernel/trace/ftrace.c | |
| parent | 73feb8d5fa3b755bb51077c0aabfb6aa556fd498 (diff) | |
| download | linux-3640bf8584f4ab0f5eed6285f09213954acd8b62.tar.xz | |
ftrace: Add support to resolve module symbols in ftrace_lookup_symbols
Currently ftrace_lookup_symbols iterates only over core symbols,
adding module_kallsyms_on_each_symbol call to check on modules
symbols as well.
Also removing 'args.found == args.cnt' condition, because it's
already checked in kallsyms_callback function.
Also removing 'err < 0' check, because both *kallsyms_on_each_symbol
functions do not return error.
Reported-by: Martynas Pumputis <m@lambda.lt>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20221025134148.3300700-3-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index fbf2543111c0..72de9009a6a0 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -8267,6 +8267,10 @@ struct kallsyms_data { size_t found; }; +/* This function gets called for all kernel and module symbols + * and returns 1 in case we resolved all the requested symbols, + * 0 otherwise. + */ static int kallsyms_callback(void *data, const char *name, struct module *mod, unsigned long addr) { @@ -8309,17 +8313,19 @@ static int kallsyms_callback(void *data, const char *name, int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs) { struct kallsyms_data args; - int err; + int found_all; memset(addrs, 0, sizeof(*addrs) * cnt); args.addrs = addrs; args.syms = sorted_syms; args.cnt = cnt; args.found = 0; - err = kallsyms_on_each_symbol(kallsyms_callback, &args); - if (err < 0) - return err; - return args.found == args.cnt ? 0 : -ESRCH; + + found_all = kallsyms_on_each_symbol(kallsyms_callback, &args); + if (found_all) + return 0; + found_all = module_kallsyms_on_each_symbol(kallsyms_callback, &args); + return found_all ? 0 : -ESRCH; } #ifdef CONFIG_SYSCTL |