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module: Fix "warning: variable 'exit' set but not used" 

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>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Christophe Leroy 2022-06-12 17:33:20 +02:00 committed by Luis Chamberlain
parent cfa94c538b
commit f963ef1239
1 changed files with 5 additions and 4 deletions
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9
kernel/module/main.c
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@ -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