linux-kernel - [RFC PATCH 2/5] module: Unlink module with RCU synchronizing instead of stop

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Date:	Mon, 25 Aug 2014 10:55:34 +0000
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Lucas De Marchi <lucas.demarchi@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [RFC PATCH 2/5] module: Unlink module with RCU synchronizing
 instead of stop_machine

Unlink module from module list with RCU synchronizing instead
of using stop_machine(). Since module list is already protected
by rcu, we don't need stop_machine() anymore.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---
 kernel/module.c |   18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 4c8a4f1..84b068d 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1697,18 +1697,6 @@ static void mod_sysfs_teardown(struct module *mod)
 	mod_sysfs_fini(mod);
 }
 
-/*
- * unlink the module with the whole machine is stopped with interrupts off
- * - this defends against kallsyms not taking locks
- */
-static int __unlink_module(void *_mod)
-{
-	struct module *mod = _mod;
-	list_del(&mod->list);
-	module_bug_cleanup(mod);
-	return 0;
-}
-
 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
 /*
  * LKM RO/NX protection: protect module's text/ro-data
@@ -1858,7 +1846,11 @@ static void free_module(struct module *mod)
 
 	/* Now we can delete it from the lists */
 	mutex_lock(&module_mutex);
-	stop_machine(__unlink_module, mod, NULL);
+	/* Unlink carefully: kallsyms could be walking list. */
+	list_del_rcu(&mod->list);
+	/* Wait for RCU synchronizing before releasing mod->list. */
+	synchronize_rcu();
+	module_bug_cleanup(mod);
 	mutex_unlock(&module_mutex);
 
 	/* This may be NULL, but that's OK */


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