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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>
This commit is contained in:
Yuntao Wang 2022-01-20 06:59:49 +00:00 committed by Steven Rostedt (Google)
parent e4931b824a
commit 2889c658b2
1 changed files with 13 additions and 4 deletions
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17
kernel/trace/ftrace.c
View File

@ -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;