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Diffstat (limited to 'kernel/softirq.c')
-rw-r--r--kernel/softirq.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index bdbe9de9cd8d..6edfc2c11d99 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -21,6 +21,7 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/rcupdate.h>
+#include <linux/ftrace.h>
#include <linux/smp.h>
#include <linux/tick.h>
@@ -79,13 +80,23 @@ static void __local_bh_disable(unsigned long ip)
WARN_ON_ONCE(in_irq());
raw_local_irq_save(flags);
- add_preempt_count(SOFTIRQ_OFFSET);
+ /*
+ * The preempt tracer hooks into add_preempt_count and will break
+ * lockdep because it calls back into lockdep after SOFTIRQ_OFFSET
+ * is set and before current->softirq_enabled is cleared.
+ * We must manually increment preempt_count here and manually
+ * call the trace_preempt_off later.
+ */
+ preempt_count() += SOFTIRQ_OFFSET;
/*
* Were softirqs turned off above:
*/
if (softirq_count() == SOFTIRQ_OFFSET)
trace_softirqs_off(ip);
raw_local_irq_restore(flags);
+
+ if (preempt_count() == SOFTIRQ_OFFSET)
+ trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
}
#else /* !CONFIG_TRACE_IRQFLAGS */
static inline void __local_bh_disable(unsigned long ip)