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authorThomas Gleixner <tglx@linutronix.de>2008-10-02 10:50:53 +0200
committerIngo Molnar <mingo@elte.hu>2008-10-02 10:58:04 +0200
commit8e85b4b553fc932e1c5141feb5fda389b7f5db01 (patch)
tree2e3f1894e36be800aadeac7ed86ebb4f9fb992a3
parent978b0116cd225682a29e3d1d5010319bf2de32c2 (diff)
downloadop-kernel-dev-8e85b4b553fc932e1c5141feb5fda389b7f5db01.zip
op-kernel-dev-8e85b4b553fc932e1c5141feb5fda389b7f5db01.tar.gz
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>
-rw-r--r--kernel/softirq.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 82e32aa..1cf1e2f 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++;
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