linux-kernel - [V2 PATCH 3/3] module: dd missing synchronize

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Message-Id: <1331463255-31019-3-git-send-email-xiyou.wangcong@gmail.com>
Date:	Sun, 11 Mar 2012 18:54:15 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: [V2 PATCH 3/3] module: dd missing synchronize_sched()

I am not sure about this patch, my understanding is that
after every list del/add, we should call synchronize_sched()
to mark the end of update. Does this patch make sense?

Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 kernel/module.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index db402a8..e1d8fae 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1785,6 +1785,7 @@ static void free_module(struct module *mod)
 	mutex_lock(&module_mutex);
 	stop_machine(__unlink_module, mod, NULL);
 	mutex_unlock(&module_mutex);
+	synchronize_sched();
 	mod_sysfs_teardown(mod);
 
 	/* Remove dynamic debug info */
@@ -2935,6 +2936,7 @@ static struct module *load_module(void __user *umod,
 	module_bug_finalize(info.hdr, info.sechdrs, mod);
 	list_add_rcu(&mod->list, &modules);
 	mutex_unlock(&module_mutex);
+	synchronize_sched();
 
 	/* Module is ready to execute: parsing args may do that. */
 	err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
-- 
1.7.7.6

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