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| author | Yuntao Wang <ytcoode@gmail.com> | 2022-01-20 07:59:49 +0100 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-05-27 03:12:59 +0200 |
| commit | 2889c658b2fbc7ad4c5d541734fdc1d97b130753 (patch) | |
| tree | 4f730602509b01e14b9776ada4226433c3136f34 /kernel/trace | |
| parent | tracing: Use trace_create_file() to simplify creation of tracefs entries (diff) | |
| download | linux-2889c658b2fbc7ad4c5d541734fdc1d97b130753.tar.xz linux-2889c658b2fbc7ad4c5d541734fdc1d97b130753.zip | |
ftrace: Deal with error return code of the ftrace_process_locs() function
The ftrace_process_locs() function may return -ENOMEM error code, which
should be handled by the callers.
Link: https://lkml.kernel.org/r/20220120065949.1813231-1-ytcoode@gmail.com
Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ftrace.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 6c5b12669e06..737e895e2aad 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6864,11 +6864,16 @@ void ftrace_module_enable(struct module *mod) void ftrace_module_init(struct module *mod) { + int ret; + if (ftrace_disabled || !mod->num_ftrace_callsites) return; - ftrace_process_locs(mod, mod->ftrace_callsites, - mod->ftrace_callsites + mod->num_ftrace_callsites); + ret = ftrace_process_locs(mod, mod->ftrace_callsites, + mod->ftrace_callsites + mod->num_ftrace_callsites); + if (ret) + pr_warn("ftrace: failed to allocate entries for module '%s' functions\n", + mod->name); } static void save_ftrace_mod_rec(struct ftrace_mod_map *mod_map, @@ -7201,15 +7206,19 @@ void __init ftrace_init(void) pr_info("ftrace: allocating %ld entries in %ld pages\n", count, count / ENTRIES_PER_PAGE + 1); - last_ftrace_enabled = ftrace_enabled = 1; - ret = ftrace_process_locs(NULL, __start_mcount_loc, __stop_mcount_loc); + if (ret) { + pr_warn("ftrace: failed to allocate entries for functions\n"); + goto failed; + } pr_info("ftrace: allocated %ld pages with %ld groups\n", ftrace_number_of_pages, ftrace_number_of_groups); + last_ftrace_enabled = ftrace_enabled = 1; + set_ftrace_early_filters(); return; |