From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Luis Chamberlain <mcgrof@kernel.org>, linux-modules@vger.kernel.org
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>
Subject: [PATCH] module: Fix "warning: variable 'exit' set but not used"
Date: Sun, 12 Jun 2022 17:33:20 +0200 [thread overview]
Message-ID: <a7e1cf121cc52969878d0450b273e7fa10043835.1655047991.git.christophe.leroy@csgroup.eu> (raw)
When CONFIG_MODULE_UNLOAD is not selected, 'exit' is
set but never used.
It is not possible to replace the #ifdef CONFIG_MODULE_UNLOAD by
IS_ENABLED(CONFIG_MODULE_UNLOAD) because mod->exit doesn't exist
when CONFIG_MODULE_UNLOAD is not selected.
And because of the rcu_read_lock_sched() section it is not easy
to regroup everything in a single #ifdef. Let's regroup partially
and add missing #ifdef to completely opt out the use of
'exit' when CONFIG_MODULE_UNLOAD is not selected.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
kernel/module/main.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/module/main.c b/kernel/module/main.c
index fed58d30725d..0548151dd933 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -2939,24 +2939,25 @@ static void cfi_init(struct module *mod)
{
#ifdef CONFIG_CFI_CLANG
initcall_t *init;
+#ifdef CONFIG_MODULE_UNLOAD
exitcall_t *exit;
+#endif
rcu_read_lock_sched();
mod->cfi_check = (cfi_check_fn)
find_kallsyms_symbol_value(mod, "__cfi_check");
init = (initcall_t *)
find_kallsyms_symbol_value(mod, "__cfi_jt_init_module");
- exit = (exitcall_t *)
- find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module");
- rcu_read_unlock_sched();
-
/* Fix init/exit functions to point to the CFI jump table */
if (init)
mod->init = *init;
#ifdef CONFIG_MODULE_UNLOAD
+ exit = (exitcall_t *)
+ find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module");
if (exit)
mod->exit = *exit;
#endif
+ rcu_read_unlock_sched();
cfi_module_add(mod, mod_tree.addr_min);
#endif
--
2.35.3
next reply other threads:[~2022-06-12 15:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-12 15:33 Christophe Leroy [this message]
2022-07-01 21:45 ` [PATCH] module: Fix "warning: variable 'exit' set but not used" Luis Chamberlain
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