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)