From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 2 Oct 2008 08:50:53 +0000 (+0200)
Subject: softirqs, debug: preemption check
X-Git-Tag: v2.6.28-rc1~271^2^3~1
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=8e85b4b553fc932e1c5141feb5fda389b7f5db01;p=linux-2.6-omap-h63xx.git

softirqs, debug: preemption check

if a preempt count leaks out of a softirq handler it can be very hard
to figure it out. Add a debug check for this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 82e32aadedd..1cf1e2f2c40 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -205,7 +205,18 @@ restart:
 
 	do {
 		if (pending & 1) {
+			int prev_count = preempt_count();
+
 			h->action(h);
+
+			if (unlikely(prev_count != preempt_count())) {
+				printk(KERN_ERR "huh, entered sotfirq %ld %p"
+				       "with preempt_count %08x,"
+				       " exited with %08x?\n", h - softirq_vec,
+				       h->action, prev_count, preempt_count());
+				preempt_count() = prev_count;
+			}
+
 			rcu_bh_qsctr_inc(cpu);
 		}
 		h++;