[RFC PATCH 1/2] lockdep: Add a assert_in_softirq()

[Sebastian Andrzej Siewior]

From: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>

Instead of directly warn on wrong context, check if softirq context is
set. This check could be a nop on RT.

Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
 include/linux/lockdep.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 6fc77d4dbdcd..59363c3047c6 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -608,11 +608,17 @@ do {									\
 			  "IRQs not disabled as expected\n");		\
 	} while (0)
 
+#define lockdep_assert_in_softirq()	do {				\
+		WARN_ONCE(debug_locks && !current->lockdep_recursion &&	\
+			  !current->softirq_context,			\
+			  "Not in softirq context as expected\n");	\
+	} while (0)
 #else
 # define might_lock(lock) do { } while (0)
 # define might_lock_read(lock) do { } while (0)
 # define lockdep_assert_irqs_enabled() do { } while (0)
 # define lockdep_assert_irqs_disabled() do { } while (0)
+# define lockdep_assert_in_softirq() do { } while (0)
 #endif
 
 #ifdef CONFIG_LOCKDEP
-- 
2.17.0