Commit 71d8d153 authored Mar 26, 2019 by Joel Fernandes (Google) Committed by Paul E. McKenney May 25, 2019

lockdep: Add assertion to check if in an interrupt

In rcu_rrupt_from_idle, we want to check if it is called from within an
interrupt, but want to do such checking only for debug builds. lockdep
already tracks when we enter an interrupt. Let us expose it as an
assertion macro so it can be used to assert this.

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Cc: kernel-team@android.com
Cc: rcu@vger.kernel.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

parent e015a341

include/linux/lockdep.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -632,11 +632,18 @@ do { \
		"IRQs not disabled as expected\n"); \
		} while (0)

		#define lockdep_assert_in_irq() do { \
		WARN_ONCE(debug_locks && !current->lockdep_recursion && \
		!current->hardirq_context, \
		"Not in hardirq 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_irq() do { } while (0)
		#endif

		#ifdef CONFIG_LOCKDEP

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