linux-kernel - [PATCH 6/7] module: Add MODULE_STATE

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Date:	Tue, 11 Nov 2008 15:57:29 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>
CC:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	David Miller <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>,
	systemtap-ml <systemtap@...rces.redhat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 6/7] module: Add MODULE_STATE_LIVE notify

Add a module notifier call which notifies that the state of a module changes
from MODULE_STATE_COMING to MODULE_STATE_LIVE.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
---
 kernel/module.c |    2 ++
 1 file changed, 2 insertions(+)

Steven, Ananth told me that this patch might also help to solve
cmpxchg problem.

Index: 2.6.28-rc4/kernel/module.c
===================================================================
--- 2.6.28-rc4.orig/kernel/module.c
+++ 2.6.28-rc4/kernel/module.c
@@ -2346,6 +2346,8 @@ sys_init_module(void __user *umod,
 	/* Now it's a first class citizen!  Wake up anyone waiting for it. */
 	mod->state = MODULE_STATE_LIVE;
 	wake_up(&module_wq);
+	blocking_notifier_call_chain(&module_notify_list,
+				     MODULE_STATE_LIVE, mod);

 	mutex_lock(&module_mutex);
 	/* Drop initial reference. */

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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