module: remove module_text_address()

Impact: Replace and remove risky (non-EXPORTed) API

module_text_address() returns a pointer to the module, which given locking
improvements in module.c, is useless except to test for NULL:

1) If the module can't go away, use __module_text_address.
2) Otherwise, just use is_module_text_address().

Cc: linux-mtd@lists.infradead.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 13 deletions

diff --git a/kernel/module.c b/kernel/module.c
index bd15a94f91c1..8ddca629e079 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -908,8 +908,10 @@ void symbol_put_addr(void *addr)
         if (core_kernel_text((unsigned long)addr))
                 return;
 
-        if (!(modaddr = module_text_address((unsigned long)addr)))
-                BUG();
+        /* module_text_address is safe here: we're supposed to have reference
+         * to module from symbol_get, so it can't go away. */
+        modaddr = __module_text_address((unsigned long)addr);
+        BUG_ON(!modaddr);
         module_put(modaddr);
 }
 EXPORT_SYMBOL_GPL(symbol_put_addr);
@@ -2821,17 +2823,6 @@ struct module *__module_text_address(unsigned long addr)
         return mod;
 }
 
-struct module *module_text_address(unsigned long addr)
-{
-        struct module *mod;
-
-        preempt_disable();
-        mod = __module_text_address(addr);
-        preempt_enable();
-
-        return mod;
-}
-
 /* Don't grab lock, we're oopsing. */
 void print_modules(void)
 {