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tracing/kprobes: Fix build error when find_module() is not available

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The kernel test robot reported that the find_module() is not available
if CONFIG_MODULES=n.
Fix this error by hiding find_modules() in #ifdef CONFIG_MODULES with
related rcu locks as try_module_get_by_name().

Link: https://lore.kernel.org/all/172056819167.201571.250053007194508038.stgit@devnote2/

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407070744.RcLkn8sq-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202407070917.VVUCBlaS-lkp@intel.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google) 2024-07-10 08:36:31 +09:00
parent 9d8616034f
commit b10545b6b8
1 changed files with 19 additions and 6 deletions
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25
kernel/trace/trace_kprobe.c
View File

@ -794,6 +794,24 @@ static int validate_module_probe_symbol(const char *modname, const char *symbol)
return 0;
}
#ifdef CONFIG_MODULES
/* Return NULL if the module is not loaded or under unloading. */
static struct module *try_module_get_by_name(const char *name)
{
struct module *mod;
rcu_read_lock_sched();
mod = find_module(name);
if (mod && !try_module_get(mod))
mod = NULL;
rcu_read_unlock_sched();
return mod;
}
#else
#define try_module_get_by_name(name) (NULL)
#endif
static int validate_probe_symbol(char *symbol)
{
struct module *mod = NULL;
@ -805,12 +823,7 @@ static int validate_probe_symbol(char *symbol)
modname = symbol;
symbol = p + 1;
*p = '\0';
/* Return 0 (defer) if the module does not exist yet. */
rcu_read_lock_sched();
mod = find_module(modname);
if (mod && !try_module_get(mod))
mod = NULL;
rcu_read_unlock_sched();
mod = try_module_get_by_name(modname);
if (!mod)
goto out;
}