linux-kernel - Re: [this_cpu_xx V7 7/8] Module handling: Use this_cpu

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Date:	Wed, 16 Dec 2009 10:10:30 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@....ul.ie>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [this_cpu_xx V7 7/8] Module handling: Use this_cpu_xx to
 dynamically allocate counters

Fixup patch:

Subject: Extend preempt_disable section around module_is_live()

Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>

---
 include/linux/module.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6/include/linux/module.h
===================================================================
--- linux-2.6.orig/include/linux/module.h	2009-12-16 08:57:37.000000000 -0600
+++ linux-2.6/include/linux/module.h	2009-12-16 08:58:09.000000000 -0600
@@ -467,15 +467,17 @@ static inline int try_module_get(struct
 	int ret = 1;

 	if (module) {
+		preempt_disable();
+
 		if (likely(module_is_live(module))) {
-			preempt_disable();
 			__this_cpu_inc(module->refptr->count);
 			trace_module_get(module, _THIS_IP_,
 				__this_cpu_read(module->refptr->count));
-			preempt_enable();
 		}
 		else
 			ret = 0;
+
+		preempt_enable();
 	}
 	return ret;
 }
--
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