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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-10-02 10:50:53 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-02 10:58:04 +0200 |
| commit | 8e85b4b553fc932e1c5141feb5fda389b7f5db01 (patch) | |
| tree | 2e3f1894e36be800aadeac7ed86ebb4f9fb992a3 /kernel/softirq.c | |
| parent | 978b0116cd225682a29e3d1d5010319bf2de32c2 (diff) | |
| download | lwn-8e85b4b553fc932e1c5141feb5fda389b7f5db01.tar.gz lwn-8e85b4b553fc932e1c5141feb5fda389b7f5db01.zip | |
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>
Diffstat (limited to 'kernel/softirq.c')
| -rw-r--r-- | kernel/softirq.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c index 82e32aadedd8..1cf1e2f2c406 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++; |